OK i will try and give as much detail.

I have received used parts in very good condition and am applying them to my 302. I am putting on a performer 289 dual plane intake manifold with a 180* thermo. On top is a 1 inch spacer with shot gun barrel holes. then the carb is an Edelbrock 600 CFM polished. i have bought the kick down levers and they are on. fuel is on and hooked up. and the idle is set to a good position not to high and not the very nickers of the carb. when i give it gas about half throttle it stay running and when i let off it dies. it wont star unless it is there. when it is it as running at high RPM. i took the carb apart and the floats move just fine.. Need help badly.