hey, changed intake yesterday and set valves(by marking balancer then turning in 1/8 turns and adjusted them 1/4 turn once i started feeling pressure on the pushrod, done all by the chart in "how to build 350"book)then put on tdc and dropped dist in cranked it up , put 34deg total timing and 18initial. readjusted floats(again) and a/f ratio. wellllllll, it does not bog or spit at all!!!!!!!! but i still have low vacuum (14-15in.)in park?????wonder what i did too fix it, i dont know but my money is on the intake, this one is better suited for my motor. but i still wish it ran better, next i think ill buy a piston stop and check true tdc the right way(instead of screw driver)But i sure would like to know why so low of vac?no leaks ;this intake fit like it was made for it, not like the other cheapo knock off.