I actually just picked up a set... should fit very clean in a Fox... however Im having some fun figuring out little clearance issues here with my 545 bbf T-bird.....uufff
Oil pan ground clearance should be fine... same thing w/ clearance from ground to the collectors.... But your top bellhousing bolts might tap the firewall...
I'm also, again.. .having steering shaft clearance issues... but again, mine's a T-bird.. virtually identical to a Fox, but every single thing with the same placement as a fox stang?....nope
You should be fine though, just dont drop the front of the car too low... or have really stiff shocks lol