What's the widest wheel and offset that will fit on 68 cuda
I'm thinking 4-1/2" BS would best case or maybe even a touch too close. But really you need to measure to be sure what will fit.
It's not difficult. Bolt a straight edge on the lugs and measure. Once you know the numbers subtract room for clearance. Check BOTH sides as they will vary.........
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In the rear:
245/60/15 with 15x7 rim with 4.25" backspace. If it's the orignal small bolt pattern it might need 1/4" spacer.
If it has new large bolt conversion axle it won't need spacer.
If you roll the outer lip, you should be able to run 15x8 4.5" backspace. And get a 265/50/15 or 275/50/15 in there.
When you are pushing the limits, every car is a little different. Especailly considering any collision or rust repair in the last 40 years you might not know about.
With stock a body 8 3/4 rear end with stock small pattern axles redrilled for large pattern (same width as SBP) on my 68 Barracuda I've ran:
225/60/15 15x7 4.25 backspace. Original old 340 springs
225/50/15 15x7 4.25 backspace. Original old 340 springs
245/50/15 slightly wider than normal autox race tires. 15x7 4.25 backspace. Original old 340 springs
235/60/15 15x7 4.25 backspace. Original old 340 springs
245/50/15 15x8 4.5 backspace. Original old 340 springs
245/50/15 15x9 4.125 backspace. completely rolled upper outer lips. Still some tiny rubbing w/Hotchiss rear lowered springs.
In chronological order.