360 running on 4 cylinders

Find someone willing to run your carb(s) on their engine. if you havent dismantled either to check for goo, that would be my next step. Buddy had me chasing timing on his small block chevy and i finally got fed up and looked in carb...
Immediate improvement.
Thanks, I've rebuild the Carter twice in the last 3 months. The Holley I took it apart and blasted with it with carb cleaner, lots of crap ran out of it. I'm not confident the Holley is any good, but the Carter was running nice and clean, exhaust wasn't nasty at all and the plugs were a nice light gray. I'm pretty confident in the Carter.