Hello everyone. I'm new here and hoping for some input. I've just purchased a 1980 Camaro with customizations. It has a 350 4 bolt main, mild cam, Vortech heads, Holly carb (search of stamped number says Avenger 670) and Holley fuel pump. Hydraulic lifters, roller rockers. It sounds as feels mean, but .. It's backfiring thru the carb on startup, once or twice max, with no power off the line and no secondary barrels on kickdown...just another backfire out the carb. It seems to run well when warm, and will run up to driving speed smooth, just not with any jump...and there should be some jump. Apparently it was not driven much these last 2 summers, coming out only a couple of times. Running well when last parked, no changes made to setup, the previous owners Father said his son was just very busy with work and couldn't make time for the car anymore. Any thoughts on potential things to look at appreciated. Thanks for reading everyone. Looking forward to participating in the forums.