+1 on what Heo said Bob, I remember before I made the chassis mods and lowered the car, the front end would start floating around at about 125 MPH. After the car was lowered I never had that issue.
Thanks guys. The pic of my Mach is a fooler as it sits on my angled drive. The car actually sits dead level (spirit bubble) at the door's top edge.
I do have all the trick "Boss 302 Chassis Manual" parts (1" drop, weld-in spring perch area sheet metal supports, 600 lb contour springs for less stiffness on bumps and much more) but, the points are well taken.
I did get slightly narrower front tires last year so I can drop the front a tad more, say 1/2"-3/4", with some spring cutting or straight coil, not contour, springs and not hit the OEM outer fender flare. I can also raise the back a tad, say 1" with some spring eye work or new leafs. Ugh though, then I need to re-set the camber/toe....but it may be worth it.
FWIW, I do like the look of a bigger (taller) aluminum front spoiler to control under-the-car airflow which is the big deal on our what I call shark-nosed '69-'70 Stangs which also btw makes it look great...except for airflow! Yet as I noted before, way over $1K for race shop fabication, supports etc. Worse, the poor streets/highways here in Illinois, land-of-the-damaged cars, would rip same off in a heartbeat!
p.s new avatar car pic soon.