Im gonna try em on my 73.
I have 14.5" between the inner quarter housing and the wheel lip.
I could roll the lip at least another 1/2".
325/50's spec out at 28" diameter, 11" tread and 13" section width.
Provided you get them centered in the wheel well, they should tuck in there with 1" to spare on each side.
Im thinking a 10" rim with 5.5" backspace. :thumbsup: