10 " wide wheel

72bluNblu said

It depends on the B-body 8 3/4, there's several different widths depending on the year. I have a 68-70 B body 8 3/4 in my Duster, and with a 1/2" spring offset my 18x10's are at 7" of backspace. You'd want less on a 15" wheel because of the sidewall, but not that much less.

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Im sure you're right.
Sometimes I get tired of guys asking here what wheels and tires fit, when we aren't there, and they can actually put a tape measure on their own car, cause they are there.
I know what fits on my cars, cause I did my own measuring. It's not hard.
As mopowers said, put a wheel and tire on that fits and you know the bs, see where it can get bigger and wider, and then find a wheel that works.