Any tire (size) suggestions for 15x8 front and 15x10 rear SS Cragers on a '69. Also, I'm assuming these fit (rear) without any modification issues? I'm thinking both front and rear are fairly conservative and shouldn't be any problem.

I have 15 x 8 Rallys in the front with 235/60R/15 in front, with no problem.
On another 69 I have 15 x 8 Weld Draglites with 275/60R/15 in rear, no isues, but close fit.
Not sure on backspace.