Couple articles have explained this part. Made for Chevrolet 265 and 283. 1 Four big Rochester 2 barrels as close to ports as you can get. 2 Nozzle for each carb and pair of ports in Man-A-Fre 'manifold'. Okay.Here is the question. What is the rest of the system? Between fuel tank and nozzles. All articles I have seen go into all kinds of detail about these items and then zippo nada nothing about plumbing and fuel pump. Thanks.