whats the tallest and widest tire for 74?

[74sat318]

Whats the tallest and widest tire that will fit a stock rear wheel well on my 74 Satellite , what also would be the rim size and backspacing that the tire needs to be on, only looking at 15" rims that I want to use since I have 15" skinny fronts

 

[waygun]

27560R15 on 15X8 rim,4.50" backspacing.

 

[Revhendo]

I have 275/60/15's on 8" rims with 3.75" bs. Could probably go 295's with a wider rim and more backspacing....

 

[scotteg]

I also have 285-15 with 4 inch BS. I have about a 1/2 inch of space to the finder.