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Hi all, need some carb advice. I'm hoping the 451 will be finished in a month or two and need some advice on a carb for it. HEre's the situation: my dad's 340 swinger had a 750 AFB COMP SERIES carb when he bought it (way too big), and of course it smoked a bit, likely washing down the cylinder...

I need some help as I'm starting to get parts to redo the entire fuel system. Do you need a fuel return when running a mechanical fuel pump? I'm looking at a 3/8" sending unit and feed line with a mechanical carter fuel pump and a 750 Carter Comp Series AFB on a 451. The sending unit has a...