A-body 8-3/4. They are rocket racing wheels.
Finding a wheel and tire combo is tough. I’ve found the rear size is much easier to find than the front. If you want a 9” wheel on the front, you will need 6.5” of backspace. They are out there, but then you won’t get the same wheel with the correct backspace. The easy, but expensive solution is custom wheels.
Take a look at Forgestar. They have 2 stock designs that are offered in sizes that will work on my car. They can also do custom backspace.
I could easily run a taller tire on the rear, but I wanted to keep the front and rear close to the same height. You will have to do the same research on tires. Not all of them are offered in the size you may want.