Steve, I just installed a set of Centerline Telestars (Terminator Series) on my '69. They make a 15x8 with both 4.0 and 4.5 backspacing. Summit part numbers are:
4.0 backspace = CLL-135804547
4.5 backspace = CLL-135805547
The 15x7 with 4.0 inch backspacing is CLL-135704547.
The 8-inch rims are both are $128.95 and the 7-inch rim is $119.95 - extremely good prices for such nice wheels. I used 15x8 with 4.5-inch backspacing on all four corners because I wanted all four wheels to be interchangeable.
I bought Firestone tires and the recommended rim width for the 235 was 6.0 inches to 8.5 inches, so you would have no problem using 8-inch rims all the way around. Also, there is no problem running 4.5 backspacing on the front.
My website update is in the works. If you want to see what they look like on the car I can shoot you an e-mail.
1969 Camaro - Intense Blue Pearlcoat/white (Baldwin-Motion paint scheme), stock 6.2 liter L92 with VVT, LS3 intake, Doug's Headers; Tremec TKO, 3.73 12-bolt posi.