Good morning. I promise I am not trying to be lazy - I've tried reading the numerous posts regarding different carburetors and am really stumped. First I'll admit I'm kind of a novice and have zero skills when it comes to tuning carbs. I think I could learn but it would be much easier if I had someone in person showing me as opposed to watching Holley youtube videos. I have a 73 XR-7 convertible that I love and have running 95% the way I would like. The engine is a 351C that I think is fair to describe as mildly modified. It was rebuilt in 1998 and the person who rebuilt it at that time said he brought it to more muscle car specs which it did not have coming out of the factory in 72/73. I know the cam is a 278 (pretty sure Crane Cams 278). When it was rebuilt in 1998 the builder put a Holley single plane intake with an Edelbrock carb. A couple of years ago I had another shop switch it to an Edelbrock performer intake with a Holley 83670 carb. Everything runs great EXCEPT from takeoff in gear. In drive at a stop the idle is about 650RPM which I think is appropriate (any suggestions though I welcome). When you try to gun it to take off the car hesitates dramatically, sometimes accompanied by a small backfire. I've tried living with it but enough is enough. I just had the C6 transmission rebuilt, a couple of years ago had the whole rear end done with 3.5 gears, the poor thing is ready to run and this is driving me crazy. Recently I've been reading about this possibly being an accelerator pump issue and that these nozzles can be changed out (watched a Holley video discussing it). My questions for the group are:
1) Should I stick with this carb? It runs great other than the acceleration from a stop issue.
2) If I should switch carbs what to go to? Sounds like Quickfuel is a fan favorite, but I also have questions about whether or not the 670CFM carb is the right size for a mildly tuned 351C? Some have told me that 670CFM might be too big but from reading other posts I find this odd.
Thanks a million to anyone who can share their thoughts / experiences.