Wheel and tire question for 68 GTS

Hi folks. New kid on the block. Just rescued a 1968 Dart GTS from a chevy guy in Chicago. I'm looking to upgrade the 14 x 5.5 inch stock wells to 15x7's all around. I saw wheel vintiques has them but you need to buy their poverty caps. I poverties on them on now.
I want the tires to fit on the car, improve handling and look good doing so. I don't want to worry about fitment or mods or moving the rear springs. What I wanted to do was to put 215/60/15's on the front and 235/60/15's on the back, radial T/A's.
Is this 2 size difference a good look on car? Would 215/65/15s be better on the front for steering? Car has power nothing. The front end is solid, front and rear shocks are new and the rear springs are new +1's from ESPO in PA.
Trying to get thoughts and the look and handling.
Car is stock, original motor trans and rear, 3 pedal car so I want to maintain the stock look. Thanks in advance. I'll try to post pictures but I'm a technological idiot.
Rob

I have 215s all the way around on mine. 15x7 in the rear and 15x6 in the front. 235s will fit with the correct offset.