I have a Holley 3310-2 that I had converted into a 4150. I recently put a Proform non-choke body on because I didn't want a choke and Holley didn't offer one for the vacuum carbs. I had 72 primary jets and 78 secondary before the body swap. I now have 72 primary and 79 secondary. The 79 was the largest I had, more on order from Jegs. The car is a 450HP 390 FE engine, car weighs 3440 without me. I took it for a drive today with the newly modified carb and after its warmed up it has a hesitation on acceleration with a very faint popping out the exhaust. It seems like it may be starving a bit for fuel but I'm no carb expert so I'm looking for advice. I understand that the bleeds may be larger on the Proform but I've never dealt with them before so before I screw things up I thought I'd ask here. I do have a 4 corner Holley HP that I run at the track and did on the street but it really burns rich on the street and fouls plugs. It runs nice at the track with the HP. I'd like to get the vacuum 750 working good on the street and it will save a few gallons when cruising.