I just rebuilt top half of motor car rac great for a week but now keeps stalling. starts right back up just pop the clutch will also sit at an idle and run forever .any clues?

Fuel pump? fuel line blokage? fuel pressure regulater? hope you find it. I'm no expert but there are a few here and they will jump in soon and help i'm sure. Cheers and welcome to the boards.

What year model is your vette? Sounds like EGR sticking or idle control motor wiggin out on you. Have you set timing correctly by unplugging "Set Timing" connector, set timing, then plug it back in.