340 has a hard time starting when hot?

Ok, that would help, thanks. IF IT IS "some kinda" AFB, AVS, or Edelbrock variant and it does not have the THICK insulator gasket under it, it needs one badly. I would recommend the Edelbrock 9265, or 9266, depending on what style intake it has. The 9255 is an open hole gasket and the 9266 is the divided plenum gasket. So whichever intake you have, there is a gasket for it. DO NOT substitute for these gaskets. They are very thick (over 1/4") and other gaskets fall short. "This could" solve your problem.

Hornin in here , I have a return f.inj. set up "no boiling gas anywhere, when I drive the car and its warmed up , it wont turn over on the first hit of the key, second hit turns over and starts, has always done it when at normal temps. , but seems to be getting worse , did it upon cold start up yesterday. Cranks good when turning over ------Any ideas ??