Dual Snorkel Breather

[blown motor]

I have no idea if this is a good price but it looks to be in great condition. Price is Canadian dollars. About $450US

https://www.kijiji.ca/v-other-auto-parts-and-accessories/sudbury/mopar-dual-snorkel-breather-440/1309491027?enableSearchNavigationFlag=true

[73440]

This dual snorkel was on my 68 440 when bought. Might need to take better care of it if they are worth that much.
From looking at Nick's Garage air cleaner identification mine looks like a 68 B body.http://www.nicksgarage.com/aircleaner.htm

[anlauto]

The one in the ad must be for a rare model or something....I can't imagine it being worth that much

[6bblgt]

I don't know if any dual snorkel air cleaners are worth $600 CAN 

& not sure if the kijiji unit is factory, mismatched or created

it's an early base (small diameter AFB) & the lid looks like mid-'60s C-body with later ~'69 snorkels 

http://www.nicksgarage.com/aircleaner.htm

[blown motor]

From the Nick's garage photos I see what you're saying. The base and lid don't look like a matched set.