Jet sizing

I'm in the process of rebuilding an 850 Holley with mechanical secondary's for my 340 motor. The current 770 Avenger carb has vacuum secondary's. I'm hoping to improve my 60' times with the mechanical setup. Anyway, this carb was off an L-88 427 chevy motor. It has 2 power valves (primary and secondary) and the jets are 80's for the primary and secondary. I'm thinking that's too big for the primary side. Any thoughts out there where I should start? This is primarily a track car so not looking for economy.
Thanks,
Bill