And here's a shot of the narrow part of the A body 383 driver's side exhaust manifold sitting next to a hi-po 340 driver's side manifold from approximately the same angle.

And don't forget that the driver's side 340 pipe was something like 1-7/8" diameter for the first couple of feet, before feeding into a 2-1/4" pipe, and that even this dinky pipe was squished almost in half to clear the torsion bar. The exhaust pipe on my Cuda 383 is a full 2-1/2" diameter with no squishes.