Exhaust Manifolds
In the real world most guys really just need on a mild small block street car ported 72 up ones! And a cheap Summit Racing 2.5" exhaust system with good muffs.
And could even get by with a little port-blend on 318 ones would be fine.
It's a mild street car you are talking about. (Dreaming Of)
It's the real world out there, not the Fast and the Furious.