first off i never heard of a dana 51 rear . . they made a dana 50 in the front of and f250 in the late 80's and early 90's in a ifs/twin traction beam setup. . . . as for stumbing when ya hit it . . . it could be either way not getting enought fuel or getting to much . . . would have to listen to it to see which one. . . and i hate edelbrock carbs personally . . alot of people like em but i find it kinda stupid ya have to take the whole carb apart to adjust the fuel levels and stuff . . . to rejet it ya have to take the top half of the carb off . . and i'd recommend finding out what came factory in the 750 and not overstep it. . . 750 should be plenty for a 460 as long as it's not built to the hilt . . . as far as the ignition goes it's hard to say if ya got electronic or points without seeing it . . . i mean ya could spend a bunch of money for a full msd ignition system but probably not worth it