Exhaust manifold; vent check valve

[David623]

I have put a 1999 5.3 Silverado engine and trany into a 1972 Jimmie. From what I see the existing exhaust manifolds will not work without modifying the frame, from research on this website Trailblazer, Corvette, Camaro manifolds will work which is the best choice? Also I am dealing with relocating the A/C compressor, Kwik performance I think has that problem solved, sent them an email for more information. And finally I have put an Aeromotive fuel pump in the new gas tank I need to find a check valve to complete the fuel line.
I will post some pic soon, just put the rebuilt tub back on the frame.