OK need some new rear tires
currently have a p235/70r15 on a 15x7 american 5 spoke, back space 3.5

would like to use a p275/60r15 on a 15x8 5 inch backspace
66 Belvedere I stock length 8 3/4 ss spring in stock location.

what do you think? have more room now to the spring than to the wheel lip probably have to trim the wheel lip on the quarter panel as it extends in towards the tire