First 1967 383 installed in a Barracuda

A56 said
Post # 10 got me thinking about the B/ RB blocks and since they mentioned the older built 383 required I was wondering why? Putting a B block 383 in a Barracuda couldn't be more taxing than the taller RB 440.

Because the RB block is about 1" taller and wider than the B block...

It's more of a challenge to fit it in the narrow A body engine compartment from 67 and later than the B block...