305 will fit if the wheel is built perfectly. You have plenty of width back there. You can get over 1/2" if you trim/roll the fender lip. The biggest problem with these cars is the lower shock mounts. They are at an insanely steep angle outward, and really limit wheel width. If you've modded the rear suspension, it's not an issue. My car measures 14" from my trimmed outer fender, to inner fender. I can get an 11" wheel back there no problemo. Stock tubs.
275 on front is a go, as long as your control arms allow wheel width at full lock. My Global West units will let me get a 9.5" or maybe even a 10" wheel up front if I wanted.
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