[tgbmd123]

BACKDRAFT AC Cobra replica, 302 cu in, 340 hp, Holly 4 barrel carb, MSD non vacuum distributor. mileage 3000.
The idle is very rough.
There is very litte low end power.
It is necessary to get it up to over 3000 rpm in oder to feel any power.
I have set the Mixture screws on the carb to maximum vacuum -15psi, about 2 turns back on both sides. Timing hits the mark on the balancer but I cannot see any degree marks. I think 12 degrees BTDC @ 900 rpm and 32 degrees @ 3500 rpm is where it should be set but I am not sure which MSD springs come standard in this distributor but I assume the heavy silver advance springs are used in this application. The advance curves in the MSD manual seem to be set for high end power only, Does that mean you really have to get up to high revs to reach the best part of the tourque and power curve? It does not backfire or have any pre-detonation ping. So I assume the timing is pretty close.
What else can I do short of taking it to a dyno shop and having it professionally tunned?
Thanks, Please direct me to someone who can help me optimize performance in this monster.
TB
I will change the spark plugs and put on all new spark plug wires and coil wire.