Re: New engine build, what heads????
AFR, BRODIX, GM Fastburn, CANFIELD are all great, I would avoid dart, they are expenive, and from what I've seen first hand, they do not perform.
I'd lose the edelbrock carb quick, especially if your wanting a performance build, which this seems to be.
What size stud do the rockers require, 3/8's or the larger ones? Many good aftermarket heads accept the larger ones, and I've snapped 3/8's studs with as little as .490" lift.
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang