Thanks for some of the input. I'm going to tune on the Holley a bit and see what that does then go from there. I'm a long time chevy guy but this is a Cobra so not putting a GM motor in it ... just one of those things like for resale, etc. And maybe I'm at the wrong forum... I do not want a race car, out of the hole perf. is NOT what I want so 4.10 gears etc. not in the plan. I want a more Streetable combo. and equal or less revs at street speed. I'll get there.
What's the thought around the benefit of the vac. sec. 650 vs my double pumper? I've read that but some say on a car this light (2200lb) that vac. isn't' the way to go.