I'd stick with the 15x7s on the rear, none of the tires listed need more than 7" & the 8" wheels backspacing would have to be "dead nuts" to fit properly in the '67s quarters. Is the car mini-tubbed?
BF Goodrich Radial T/A wheels 6" front & 7" rear 225/70/15 and 255/70/15 ($840 for the four) 225/70/15 is tall, is the car sitting high in the front? Is there a smaller (215) front tire available? Car isn't sitting high. Sadly, nothing smaller than the 225/70/15
Firestone Firehawk Indy 500 wheels 7" front & 7" rear 215/65/15 and 235/60/15, or 235s all round ($800 for the four) 235 = small rear tire Is there a larger (245) rear tire available? Unfortunately, the next step up is a 275/60/15, which is VERY borderline in the 67s
Mickey Thompson Sportsman S/T wheels 7" front & 7" rear 225/60/15 and 255/60/15 ($880 for the four) 225 = small front tire - too short!! With the Sportsman S/Ts, I can also source 225/70/15s and 235/60/15s.