why do you have the idle so low? I'd think you'd want it a tad higher. I'm running a solid roller, (588) I pull about 8-9 at idle (900-1000rpm) I'm running the stock MP 6-pack, I'm using 70main jets (probably a tad rich) 35 squirters, and purple springs. I'd probably go back to square one, set your timing in full at 36* early 2200rpm, turn you mixture screws all the way in them out a turn and go from there, tweak for best vacuum. You should also make sure your outboards are opening 100% Your build should fly. not sure how the billet blocks work, but it should run fine w/ or w/o them. I adjusted my primary w/o the outboards hooked up. Good luck