tune up

I was wondering if anybody could help me with a carb problem its a quick fuel 850 q race carb. if I give it just a little to much gas when cold it catches fire at start up. I played with idle screws but the engine will not stall when I turn them in and the car runs good but this is a problem. I...

I am doing a basic tune up - I have a 64 Nova - L6 - How do I know what to gap my spark plugs to?