Anybody on here know about Chevy 1 barrel carburetors and mounting aplications? I have 3 that are identicle looking, but tags read different chevy model years/engines. I wanted to know what years they may fit or engines compatible with, but didn't want to join a chevy forum -carter yf, 1964, 194 straight six, 3821S -carter yf, 1967, 250 straight six, 4367S -carter yf, 1967, 250 straight six with manual trans, 4375S