Tire sizes for a 70 Roadrunner

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A '70 Road Runner with 15x7" wheels would've had F60-15s from the factory.
Modern equivalent would be 235/60/15s all around. 245/60/15s will fit no problem.
If you go to 255/60/15s all around the front starts getting close, maybe too close depending on your ride height.

245/60/15s on the front & 275/60/15s on the rear would work for me!!

IMO most 70 series tires on 7" wheels don't look right (narrow tire/wide wheel)

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A 215 is for a 6 inch rim and a 225/70 is for a 7 inch rim.
235s are too short unless you like the light space between the tire and rim look, or rubbing every speed bump in the parking lot???

I would think a 275 or a 295 would be a little much for a 7 inch rim???
My car looks just fine with 225/70s on a 15X7 inch rim, think, think not???

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This is 235/60-15 in front...
295/50-15 in the rear...

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as long as the ratio has a 70, or a 60, go as wide as you can, without the cartoon looking "balloon" effect taking place. 235 on front of my ride, and 275 on the rear, still looks right.

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A 215 is for a 6 inch rim and a 225/70 is for a 7 inch rim.

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235s are too short unless you like the light space between the tire and rim look, or rubbing every speed bump in the parking lot???

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I would think a 275 or a 295 would be a little much for a 7 inch rim???

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My car looks just fine with 225/70s on a 15X7 inch rim, think, think not???

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You have to be happy with your car, I'd be happy with more tire, especially on the rear. Here's a pic of my brother's '68 GTX with 225/70/15s on 15x6.0 Spyder Wheels. It works but isn't ideal, the "old school" wheels are the limiting factor.