Trouble is with a Holley 4150 HP 750 cfm w/vac 2nds on a mild 440. Motor has been sitting for about a year, I replaced the plugs and wires, power valve, needle and seat assemblies, checked float levels and verified spark. Plugs are black as coal and doesn't want to idle. Ideas would be greatly appreciated.

Everyone who said power valve raise your hand .

I pulled it apart again to swap in another power valve, noticed a piece of gasket left from the old PV and it wasn't as tight as it could be. I stripped it al down and soaked in a new can of chem-dip and put it all together cleaner and more carefully this time.

Fired right up, idle fell right in place and tweaked the timing right in. You folks are the best