I would try gapping your plugs down to .042 and back your timing off to 10degrees and work up till you feel it nose over up top, also you could prolly stand to loose a little fuel pressure with the 24's in. Set it at 40 with the line off!
Who sells "P" heads on the cheap anymore? I remember when they first hit the market they were practically given them away, now you cant find em for less than $500.00 bucks a pair. I need a set for an upcoming project car!