5/16 to 3/8 fuel line

I run about 19 degrees of advance at idle (as recommended by FBO). At a stock time setting it will hardly move itself out of the garage, so that might be your issue. By buddy had the same problem on his mid 70 Impala. His step dad acquired a 350 already put together from a friend of his. he called me saying it would backfire and die when in gear, but ran great at idle. When I checked it with the light it was something like 7 degrees. We slowly bumped it up to about 18 and it was running real nice after that.

I installed an electric pump at the tank, and decided to install 3/8 line while I was at it after reading info on FBO's website. The tank pickup is still stock, but that will get changed when I go to a new tank.