14" or 15" in front?

I have no problem with 14 x 7.5 on my 68 Barracuda at 3.75bs. I run a 235/60-14..... 25 tall,

IIRC the factory 14" SBP Rallys were 5.5 and zero offset so the bs would be 3.25

Your 205/75-14 would be about 25.3 tall, and the 15 incher adds an inch,lol.

If you have KH 4-piston brakes, they don't fit inside ALL aluminum mags, so be careful if you have those.