ok 750DP is fine. I ran one on less of a 340. try this.. 28 squirters, 74 front 80 rear jets, 6.5 PV. turn the mixture screws all the way in and back them out 1 turn, start the car take it to 1000 rpm, turn screws until you get the best vacuum reading. Set total timing w/o vacuum advance to 36* total at 2400rpm. Back the idle back down to 1k adjust mixtures again for best vacuum, take it for a romp.