Hello Centerline.Here's 275/60/15 on 8" rims with 4.5" backspacing on my '64 Polara. Stock rear suspension and tapered axle diff. Plenty of clearance to the springs and fender wells.
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I am glad that you have posted a pic complete with info.
I have purchased a pair of new steel rims for my 64 dodge 440, and I would like to put the biggest tire that I can under there.
The rims I have purchased are 15x8x41/2" backspace. I know that a lot of people on this forum are using 275/60/15 tires on a 41/2" back space, but your saying that you still have a bit of room left for possibly more tire. Measurements on a 275/60/15 are 27.3" high, section width (Total width) 11.3", tread width 9". Do you think that a 325/50/15 which is 28.10" high, section width 12.5, tread width 10.5 would massage up in there, If I ever learn how to post some pics on here I would like to post some pics on a few things of my car here.
I had 5.7 Hemi do a super stock grille for me which turned out really good, I know ya need a pic, Let me know please thanks. Preachr Canada.