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Yup, 8" is way too wide for front and will stick out the sides of the fenders in back.
I got away with 15x7 up front and 15x 8" in back, but I had to really stiffen up the rear to keep the fenders off the tire sidewalls,and my '61 car has wider fenders than a '60.
The 14" wheels won't help much.
I would stick to 15x 7 as largest, and make sure the back space is correct, as wrong backspace will put you in the same boat.
If i didn't have 427 cubes, with 400 ft-lb of rear wheel Tq at 1500 RPM, in the car, I would have gone with 7" wide wheels on the rear
I also have a narrowed 12 bolt rear end, which IIRC, is slightly narrower than stock at the wheel mounting flanges. Not much narrower, maybe 3/8" per side.