Well I have the reverse, 454 manifolds on a 350, so I would think so.
on the driver side head just above exhaust manifold
What are the differences between a 350 and a 454 engine?
Yes. The exhaust is different, and you'll need a bigger radiator.
pretty much any 454 exhaust manifold will fit
Yes. You'll need to change the exhaust and cooling systems.
If the 454 is complete with accessories such as exhaust manifolds, a/c, power steering, alternator, etc., it should be a pretty straightforward swap. Transfer the motor mounts and distributor from the 350. A new exhaust system will likely be needed.
Yes. The exhaust would be different.
Yes. The exhaust will be different, and if it's a big engine going in and a small engine coming out, you might need a bigger radiator.
40 lbs
No. The 454 is an externally balanced engine, the 350 is internally balanced.
what exhaustmanfold fits a 454 engine 1975 to 1980
It's mostly a bolt-in. Bring over the accessory drive with the new engine, along with the exhaust manifolds. Transfer the distributor from the 350. "some assembly required"