I personally like 60 series tires. I had P 245/60R14 on the front on my old 1969 and they cleared with no rubbing on 14x6's.
However, you made it clear you want to stick with 70 series tires. I would try to keep the same size all the way around. P215/70R14 is more common as that particular size was OEM on Ford Ranger pickup trucks in the late 1980's. I think the Ford T-Bird may have used this size as well in the 1980's.
P225/70R14 all the way around will be fine. I like having the same size all the way around. Show me one Camaro where at least 100 units of it were made which had bigger sized tires in the back than the rear.
Funny how some of the so called purists bash me and others for having an electric fan in our cars, an MSD box with MSD igntion, a Moser 12 bolt, or Ford 9", traction bars, etc, etc. while there car is all OE except for one thing. But yet when I want the same size P235/60R15 tires on my car with Rally wheels all the way around, these purists think I'm nuts. BUT, these are the same purists who still run the factory A/C Delco points distributor, or dual point distributors and run 17" custom wheels...Go figure!!
FWIW, I had P/S on my old 1969 but I replaced the gear box with a manual gear box after the Big Block went in. Big Mistake!! Keep the P/S in it. My current 1969 has p/s and I'm leaving it in there no matter what!!
If you do not have P/S the 60 series tires will help improve the vehicle's handling. You could go P235/60R14 or P245/60R14 on a 14x7 wheel and you should be fine. But if you are going to run 70 series tires as you wanted I would run P225/70R14 all the way around. I worked in the auto service indusrty between 1989-1998 and I sold tires as well during that time. The P225/70R14's may be hard to find in this day & age. Heck they were difficult to find 15 years ago!!
A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more!