I have a 64 -4door as well
Welcome to the site!
I have 14x7 wheels (I think it is a 3.75" backspacing) on stock drum brakes. Running 245/60R14 Diamond Back III white wall tires (BF Goodrich tires T/A Radials with a white wall vulcanized on them) that are 25.6” Diameter. According to my notes, the recommended rim for the tires was 7"-8.5" wide. The tires are not as tall as stock, so it sits lower. Not too noticeable, but gives it a nicer stance. How much lower that is, I am not sure, but I do notice I have to bend over a little to reach the door handle. As it is, I have to really slow down over speed bumps to keep the mufflers from scraping.
On the suspension side, it is fairly stock:
Moog 658A front (listed as SS springs)
Moog 6033 rear (listed as Heavy Duty)
Energy Suspension Poly Graphite bushings
Addco front anti-sway bar.
The springs firm up the ride so it is not floating all over the place like the old springs I had. Rides more like a modern car, nice balance between firm enough, but not harsh.