Just to clarify;
-The Aspen is an F-body with the funky transverse T-bars. Those LCAs wont work. Im pretty sure the uppers will.But the lowers on your 65s should be right on. The UBJ pins on your car now, wont fit the Aspen spindles. But as mentioned, any 73 to 76 big BJ UCA will fit. Trebleg is eager to meet your needs. As far as swaps go, this one is easy and effective.
-Some guys here have mentioned that the Mirada calipers interfere with certain wheels, on the 11 inch rotors. Seems the corners have to be ground off the calipers. I forget what wheels. 500s maybe? IDK.
Hope this helps.