Need some advice on slicks for my '67 Notch

I have a 15x8 4.5bs Hoosier 10.5x28 and they are too wide (lip) and they just hit the leaf spring with the 12.1 section width of the tire. I would say 9x28 w/11.1 section width would be safe and optimal.

Thanks! That is what I was Looking for. I believe those 15 x 8 rims have 4 3/4 back spacing. I have a set of 5/16 spacers as well, if needed.

Rusty RRob: thanks, I never would have thought of that!