Removing bolts from a manual pedal support bracket

[bc3j]

Over the past several years I've been acquiring parts to add power brakes to my 70 Challenger RT. I'm pondering whether or not I actually want to do it. The trouble spot for me is those two upper bolts on the manual pedal support bracket.

Can I:

Remove the pedal support bracket without major disassembly and deal with it outside the car,
Cut the back of the bolts off with a 90* head on a Dremel with a cutting wheel in the car,
Is there other removal options without causing additional problems,
I don't want to drive them out for fear of bending or damaging something,
or my option still on the table is stay manual.

I have no problems braking now, just thought about adding power brakes since I have the parts. I don't want to get into a major project just to add a booster. My goal was just a "simple"  bolt in project. Don't know if that'll actually be possible. It always seems that nothing is as easy as it looks.

[anlauto]

In the engine compartment, cut the two studs off and drill a hole straight through the remaining part of the stud. Start small and work your way up to maybe 11/32" - 3/8" so that the 5/16" studs of the brake booster will mount no problem. The stud is long enough you will still be able to get nuts on the inside

[bc3j]

Thanks. You always know.