Help w/ 7 1/4 to 8 3/4 change over

You can add the '66 A-body 8 3/4 to the donor list. If you use the '67-72 rear, you'll need to use your old e-brake cables off the 7 1/4. I've also run across wheel problems in rare cases. Some of the early 13" wheels don't fit over the 10" drums. It's mainly the '64 and older wheels but sometimes the newer cars have had wheels installed from the older cars. The B-body one is not really a bolt-in. The spring perches are spaced 1" farther apart so the spring would be in a slight bind if you use it. Plus the wheels would need to be changed and tire clearance is an issue.
Mark