ive got an HP 4150 series 830 cfm holley. i suspected a minor vacum leak and changed all vacum lines and the base gasket on the carb. after reassymbly the accelerator pumps, primary and secondary are pumped up stiff and will not throw fuel out the top squirters. i removed the carb and removed the pumps, reassymbled and they were then freed up. until the bowls were full then they froze up again and no fuel through the squirters. now 2 weeks ago the 1/8 roll pin broke off the distributor drive gear and i had a HUGE backfire through the carb. but i have driven the car since then and everything was fine. and i am sure the HP carbs have the power valve backfire protection already in the carb. i am over the cliff on this one and finally just walked in and cut the lights in the sanctuary to take a breather for the upcoming 15th round, any help would be greatly appreciated and could save me hundreds in co-pays for my rapidly approaching stint!