Choppy during cruising, but accelerations without any issue?

[kawahonda]

Still choppy for cruising and slowly getting up to speed. Here is my box. Probably original.

Maybe someone has a spare I could try?

Or I can just start tearing down the carbs.

[Bullitt-]

Still choppy for cruising and slowly getting up to speed. Here is my box. Probably original.

Maybe someone has a spare I could try?

Or I can just start tearing down the carbs.

Not the ECU/Box....That's the Voltage Regulator.   Stock ECU is larger & factory mount would be a little farther car right/passenger side
Electronic ignition was not standard in '70 ..... is it possible you have an OE breaker/points system?

[kawahonda]

Hmmm.

I believe I have points. How about that Jegs kit as a next step?

Or at this point, follow stated advice and tear into the carb.

[RUNCHARGER]

Dang that car was untouched. It probably still has the points distributor. Pop the cap and have a look at them. I bet it will sweeten up with new points.

[Bullitt-]

Hmmm.

I believe I have points. How about that Jegs kit as a next step?

Or at this point, follow stated advice and tear into the carb.

I'm more interested in why your vacuum is so low... Stock would be closer to 20", your 14" could be from having a cam with a lot of overlap which could also explain what you are perceiving as choppy... those tend to sputter and have some light backfire.. Most folks refer to this a cam lope.

[kawahonda]

Dang that car was untouched. It probably still has the points distributor. Pop the cap and have a look at them. I bet it will sweeten up with new points.

Yeah but at this point (no pun intended) it makes sense to go electronic for the money IMO. One less thing to have to go out and adjust.

[kawahonda]

Hmmm.

I believe I have points. How about that Jegs kit as a next step?

Or at this point, follow stated advice and tear into the carb.

I'm more interested in why your vacuum is so low... Stock would be closer to 20", your 14" could be from having a cam with a lot of overlap which could also explain what you are perceiving as choppy... those tend to sputter and have some light backfire.. Most folks refer to this a cam lope.

I love lope! But I'd imagine this guy has an original cam. Perhaps there's another vacuum leak. Other places to check?

[Bullitt-]

Spraying carb cleaner around the base & intake, engine will increase in RPM when you hit the leak, otherwise disconnect & cap vacuum hoses to isolate accessories.

This chart may help you diagnose with the vacuum gauge.

https://www.classiccarrestorationclub.com/article/engine-vacuum-troubleshooting/

[Shane Kelley]

If your running points I would make the change to electronic ignition. IMO  That's where I would start. I'm no fan of points!

[kawahonda]

Thanks everyone. Is that unit from Jegs good for the eventual conversion?

[Shane Kelley]

Thanks everyone. Is that unit from Jegs good for the eventual conversion?

I would think it would be just fine for your application. Only thing I would consider is replacing the engine wiring harness. Get one designed for electronic ignition. Simple plug and play without any splicing. 

[Bullitt-]

Thanks everyone. Is that unit from Jegs good for the eventual conversion?

I'd spend a skosh more & get this Firecore
http://www.manciniracing.com/eldicokihiec.html

[kawahonda]

Thanks.

Today, I will spray some starting fluid and see if I can get a surge. Sound like a 14 vacuum reading for a stock motor isn't great!

My father said to buy a coil...they usually get beat-up with the heat over time. If you guys think this is a good idea, which coil is recommended?

Then I suppose it's off to take a close look/replace the points and such. Is this all easy stuff to get locally? I figure I'd eventually go to Electronic (thanks Bullitt for the link), but for now I think it would make sense to get the current system working appropriately if it's cost effective...

Then if there's still woes, that carb is gonna need to come off!

[Bullitt-]

If the car starts fairly easy & runs well at higher RPMs the points or coil are not your issue.

[Bullitt-]

Watch this... around 5-minutes it covers carb ... all good info. 

https://www.youtube.com/watch?v=X0uEMeDVxaA