Re: 2 questions
I just did a 6-lug disc brake swap on my '69.
The front wheels are 15x7's with a 4" backspace. (that's the max with a 15" rim)
I had to trim up the ball joingt area of the lower control arms and grind a little on the tie-rod area of the spindles to get the wheels to work.
If you are planning on running a set of 20's you could get away with more backspacing. I don't think your 275's are going to work on the front of a lowered truck.
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