What tire size will work with a 15x8 front wheel?

Sorry to the OP for high jacking but got a quick question.

72bluNblu I got a 68 Valiant that I'm swap front disk onto. I got a set of 2 inch drop spindles I've had for a couple of years and 11 3/4 rotors.

Looking to get rally look a likes from summit to match the back (245 60r15 small bolt pattern) for now until i swap axles at a later date. Looking to put 225 60r 15 and have the fender cover about half the sidewall.
There's two rim options 15 x 7 with 4.25 bs or 15 x 8 4.5 bs which would be better and or fit ??? Thanks