I have a 528 Iron headed 10 to 1 Hemi. Comp flat tappet hydraulic .535/.541, Mancini ready to run dizzy with a MSD blaster SS coil. Mopar performance high rise intake with a single pro systems 4150hp carb . Timing set at 32 total vacuum can capped. Car starts fine hot or cold. Runs strong but does not like low speed running. Likes to buck and surge at light to medium throttle. Vacuum is 10. Plugs are NGK R5671-9. They all seem to be firing but are black and sooty. Power valve is 6.5 with 84 mains. Trying to sort it out in a positive manner. Thanks.