Then again, What is his vacuum at idle? Could be low enough to tell him his power valve is letting in more fuel. If he is running say 10 inches of vacuum or lower at idle and with a 6.5 power valve it may be getting too much fuel in that way! Just my Amongst other things such as timing and advancement not where it should be! Hey, I'm just saying!!
Amongst other things such as timing and advancement not where it should be!