Too much engine work at once

This is the lunati:
Pretty mellow cam. The engine is a 69 with advertised comp in the day of 9.2:1.

So no, I know I cannot get it to fire right over like it was tuned already. When I did the new 4 barrel carb and intake it took about 10 seconds to fire and timing was off by 20 degrees or so. If it has to be key on and start and up to 2500 rpm in a few seconds, no way can I do that.