Tommy Turner has them on his 68...touch base with him. I persoanlly like the look of the 15" wheel....15 x 6 or 7 should work...6's might be better. 215/70 or 75 R15 all around or maybe 225's in the back. Be careful of "tire rub" with 225's on the front...The 4 piston calipers do rub sometimes depending on the wheel design.
let's see some photos...wilma