65 and 66 can be aligned and balanced using a Granada swap from a donor car BUT you will have bumpsteer problems because the arm is longer on the spindle.
Denise at CSRP engineered this problem out of his kits for the 65 and 66. You will not be able to save money by trying to find the donor car getting parts and rebuilding everything from it.
$525 is a bargain for everything you will need in 1 box.
I have his kit on our car
Christophers 66 Mustang Restoration and Modification
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A code 66 coupe
289 4v, Roller Rockers, Electric fan
Performer & 650 Edelbrock
MSD ignition
Tri Y into 2.25 Shelby side exhaust
T5 conversion & Hydraulic clutch
CSRP Discs