I've got a stock out of the box Holley #80457S 600 CFM with VS on my 351C. Timing is set at 14 with 20 more coming in at around 3000 rpm. With the engine warmed up and the choke open, if I hit the gas in drive it'll bog down a bit and then recover. If I don't back off when it bogs, the carb will backfire. I'm assuming I need to tune the carb, but I'd like some suggestions as to where to start, etc. Additional info on the engine is a Crane cam with [email protected] (single pattern), LS of 112 and 508 lift. Pertronix, full length headers into 2.5" exhaust. Stock C4 and 3.00 open rear.