[bobss396]

First off, get the timing right. I'd also go over the valve adjustment and look for a possible too tightly adjusted valve. It wouldn't hurt to richen up the mixture at least until you get it to run right, then you can back it off. Go over the cooling system and make sure the thermostat is opening. Look for a soft or collapsed hose just to rule it out.

I'm not a big fan of headers on street cars just for some of the things that you've already run across. Cast iron manifolds can be modified for better flow and can add 25-40 HP if they're done right.

Bob