A Body V8 Swap question

Let me say that before putting TTI's on my 65, I put a set on my 67 Barracuda. They were the easiest to install, best fitting headers ever. But the 64-66 engine compartment is several inches narrower. It wasn't even designed for a V8, and the manifolds Chrysler came up with to clear even for the 273 were really funky looking. At least on the driver's side. Single exhaust, too, these models never got dual exhaust.

So, I'm impressed that TTI (and Doug's) even managed to make full-length headers that will fit inside this tiny engine compartment.

Whatever exhaust you put in an early A besides the factory 273 exhaust or fenderwell headers is gonna require some work and thought on your part to really make it fit. I happen to think it's worth it, as these are wonderful cars. Just be prepared.