Re: Distributor
Back firing through the carb could be other issues to, could be running to lean, intake valve is hanging open, or improper valve adjustment. These are set at .012 intake and .018 exhaust. If you haven't checked them I would for sure. On my 305 I found several of them to tight do to ignorant shade tree mechanics who think they know it all. There may be some vacuum leaks. With the engine off, look down the throat of the carb and pump the gas, does it give a nice shot of fuel down the manifold? If so, your accelerator pump is fine. If not, there is at least part of your issues.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
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