I just bought a 69 mach1 and it ran pretty good. Well all it did was sit in my driveway and now when I start it, it wont idleor stay running even on the gas. Ill keep it at like 3000rpm and then it just dies like someone turned it off.

 

Tune up or bad gas?

 

I just put 5 gallons of premium in it and it only sat a week. Its on a slight slope and th etank was near empty so I thought it wasnt getting fuel but that wasnt it. Fuelpump is a moroso and works fine. Ever run your car at the drags and if so what did ya run? Whats needed to run cleveland heads on a windsor? Are they better than some afr 185cc heads?

 

Our strip is at 6000 feet here, so my low 14s here are low 13s at sea level I've been told. I think 4.11 gears would get me to high 12s at SL.
C heads require plugging some holes, drilling some in the block and a special intake manifold.
10 years ago, they were better than most aftermarket heads, but not nowadays...
I would do a complete tune up if I were you and maybe new wires.