Tire Advice for 1968 Barracuda

I recently purchased Weld Rodlite wheels for my 1968 Barracuda. The car has 1973 design disk brakes and suspension up front and 4.5 bolt pattern rear end with drum brakes. Super Stock springs are in stock location. I am currently running 15 X 8.5 Centerline Autodrag wheels in the rear with 4.875 backspace and 15 255 60 Mickey Thompson drag radials. Decent amount of room on the driver side ---about an inch to the spring. Passenger side is a bit tighter with 0.5 inch of clearance with a 1/4 spacer. Car hooks well at the strip --- 1.57-1.58 60 foot times with the 15 255 60 drag radials, but I am considering going to a 15 275 60 drag radial if I can safely squeeze them in. The Weld Rodlite wheels are 15x7 with 4.5 backspace for the front and 15X8 with 4.5 backspace for the rear. I currently have a 15 195 60 radial tire on the Centerline wheels up front which I think is too small (24 inches tall). What is the tallest tire I can run up front without contacting/damaging the lower front portion of the fender using the new 15x7 with 4.5 backspace? Will I have enough room with the new rear wheel size to fit 15 275 60 drag radials?