what year are you working with. older ones came with 455. i put one in a 66, with 4 speed,413 gears back in 76. lost my drivers licence after out running tn. state trooper. i dont know how to this day with that 413 in back but i stayed ahead for a long time. i was very young and very stupid but run i did.
I have one in a 64 cutlass i am building, what year are you looking to put one in?
looks like this in a 64, i bent the crap out of some new header trying to make them work in this body. I gave up and bought some W &Z manifolds, glad i did so much more room.