I've used stock Ford 14x7 steel wheels with 28x9x14 MT slicks and they worked great. I've also used steel Dodge 15x7 wheels with 28x9x15 MT slicks and they fit fine as well.
For my 66 Fairlane street car now, I have a set of 15x8 AR TTII wheels made with 4.75" backspacing to fit the 275/60-15 Goodyear Eagle GTs. Car has stock wheel tubs and spring location, as well as Cal tracs. Unless you have disk brakes on the rear, I think 5" BS would be too much, though you could add a small spacer to center it better.
Good luck
66 Fairlane GT Silver Blue "BRUTE" Genesis 496/C4
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2000 Lincoln LS Sport 5-speed |