Late model exhaust manifolds in an early A-body

I'm glad to see that you were able to bet them in. I wanted to do the same with my 70 Dart with p/s and it is a no go. If I had done a lot of work and mods I might have been able to make them work but as it were I wound up with an early 340 drivers manifold and passenger is the big outlet magnum. Dyno tests showed that the magnum manifolds were close to the 340 ones so I dont really feel like they are mismatched.