Who is running 15 inch slots on the front of their 73 and up a body?
I know it doesn't fit into your 73+ timeline, but I have slots on my 1971 Demon. 15x4 with 185/70R15 (I believe) and 15x8.5 BS 3.25" 295 60/15 Hoosier QuickTime Pros. Super stock springs in back 002 on both sides to get the height needed. Longer shocks to match.
I know it doesn't fit into your 73+ timeline, but I have slots on my 1971 Demon. 15x4 with 185/70R15 (I believe) and 15x8.5 BS 3.25" 295 60/15 Hoosier QuickTime Pros. Super stock springs in back 002 on both sides to get the height needed. Longer shocks to match.