I had fuel issues for the longest time. Mine was a rust issue. Rust was in the carb, Clogged all the lines and all the filters. I ended up running some wire into the fuel line backwards to unclog it. But after that it worked. So I relaced the fuel line. Looked good on the outside but the inside was real rusty. Fuel line is like a book, Cant judge it by its cover. Tell you what, Now that I have got it running I now enjoy it more then ever. Your not a true chevy owner until you have tryed and tryed to get it running and then when you finaly do for a few moments you enjoy the best feeling ever. Then its back to earning that great feeling.
Haha I wish you best of luck.
P.S. Working on it is half the fun.