"74 was the last year for the G60-15 on the Firebird/T/A. The equivalent would be 245/60-15. In '75 they went to the 225/70-15. Either one looks good on a 15x7 Rallye II but the 70 is taller and will throw off the speedometer. I've seen 235/60-15s on '68 Firebirds and they fit well and have sufficient space around the tire to avoid rubbing. I'd shy away from a wider tire in front. The back will go a couple sizes bigger if the cars not lowered; you'll have to experiment.
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