quite frankly, I dont remember the exact size. But I know I used a 170 main jet in which I drilled out to kinda enlarge the hole just enough to give it some restriction. I also slightly crimped the hard line to ensure that it stays in place. But again, you can use anything available. In my case, the 170 jet is an extra part that I dont use.

 

well so far none of this helped, so im flying a mechanic from north dakota to come fix my car... boo

 

Then send me a plane ticket. I'm in LA (thats Los Angeles, not Lower Alabama)

 

none of this helped we told you what the problem is YOUR FU(KING FUEL PUMP SICKS D!CK!!! The fugging problem is your fuel pump is worse than the stock 79 S fuel pump. go back to stock or get the Holley Blue. Maybe just a carter if you plan on just doing boltons and want a quiet pump(compaired to the holley)