cant seem to get it run right

[tim21391]

i know its a carb issue, but where to start.... i pulled a plug out and it had so much black soot on it.. so i know its running way to rich.. i took a wire brush and carb cleaner to each plug... but you have to take like 10 minutes of cranking to get it to start... and once you get it started it runs sorta ok.. i mean it still stumbles and such so im thinking power valve might be the problem but i dont know what size or whatever is the right one.. its a holley 750 double pumper carb on a 402.... then when u shut it off you have to take forever starting it again.... i doubt the floats are set right but i mean i pop the two access panel screws out and ive been told its right when u dont see any fuel coming out or at least a little bit.... its so un reliable because i never know if it will start or not.... i work at autozone so a guy i work with thought he might no the problem so i went to start it and had to take battery out to charge it since i had no cables so i took it to work to charge.. took it back and finally got it to fire.. then after i cleaned up plugs i had to put it back on charger because all the time cranking killed my battery...