Your experience rearbrakes only

First of all, those dual caliper Aerospaces are way overkill unless you are doing at least way over 175 in the quarter, or are trying to get around no T brake rules and footbrake a big power car. Front non vented swiss cheese rotors are a real bad idea, as are running tiny brake up front combined with behemoth ****s out back. drag car with huge contact patch out back, and front runners ok... otherwise, bad combo.

(that company rules for modern brakes though, have them on my un- appropriate car and they make my nose bleed, single 4 piston front and back with street rotors)

I think I would geek if I saw them on an A though.

 

Mine are Halibrands - magnesium - I don't know the name of the style
But the Halibrand Spindle mounts I have were made with 5 bosses cast in. We machined those bosses - fabbed up an adapter ring (because the pattern we put in the cast bosses wasn't soemthing available. I then made some standoffs to space the rotor. Used Wilwood 3/8" rotors and Wilwood dynalite singles (duals would have been better, but I didn't want to build TOO much brake since the wheels are mag).
This was MANY years ago - I would try and use a HAT today instead of the flat adapter ring w/standoffs.
Caliper bracket was a piece of 1/4" - mounted directly to the ford spindle. I still have the car - I can take pics if you'd like.

 

Another problem I see is the "Drag Race" Aerospace brakes. When using them on the street they will heat up and end up warping. This happened to me on my last street / strip car. For a street car you need a vented rotor.