'69 302 Holley
Greetings from a new poster.
I am going to be working on a '69 Z-28 with a factory 302 ci engine and the original Holley for a local shop. I have seen the car, but have not heard it run yet. Very clean, all correct as far as I can tell (AIR pump, etc.). The customer complaint is of a stumble off idle, then it goes great, with an occasional miss-fire. Carb was rebuilt by a local carb shop (I was going to handle this but ended up incapacitated for two weeks), and the stumble is still there.
I'll check the whole system out from scratch (timing, advance (vacuum, mechanical & total), accel. pump, cam, etc. Before I go over tomorrow, I'd like to know which power valve they had stock and the primary jet size of the stock Holley. I have more research to do tonight with an extensive library and I may find this, but it's unlikely.
I have 40+ years experience with performance automobiles incl. Drag Racing, SCCA trans am ('81-'84) & F-5000 and currently own a BOSS 302 and a '69 L-68 Corvette, so I've seen a few problems, I'm just trying to save a bit of time up front. Any help is appreciated, thanks in advance,