FWIW, I ran P245/60/R14 on 14x6 with a BB back in the day on my first 1969, no rubbing issues. On the 1969 mouse powered car I own now it's 15x7 Rally's all the way around w/ P235/60/R15, no rubbing issues even with passengers in the vehicle.
You may want to double check the Torq Thrusts...I have seen 15x6, 15x7 and 15x8.5 in that size. I know someone who runs a 454 in a 1969 with 15x8 Rally's and P225/70/R15 up front and surprisingly it doesn't rub...all brand new stock suspension.
As far as the tire sizes, it depends what you want to do and what your goals for the car are in regards to straight line performance, cornering/handling/braking/ etc....Back in the day even in the late 1980's & early 1990's many first gen Camaro's were driven daily by 18-24 year old kids who bought these cars as their first vehicle. They were driven in rain and once in a blue moon even snow too....Yea prices were much lower then for a decent daily driver.
A good combo would be 15x7 in the front w/ P235/60/R15...Some guys ran P225/60/R15 Goodyear Eagle VRS tires back in the day which was the road racing tire/oval track tire in a V speed rating ran by the 5.0L Mustang GT & LX's during the late 1980's/early 1990's...Those Eagle VRS tires worked great on Camaro's.....In the back you could run a 15x8 w/ a P255/60R15....The specs on most torq thrust's are 5 x4.75 bolt pattern w/ 3.75 back spacing in a 15x7....The Tire Rack recommends P225/60/R15 on the front for a 1969 w/ that Torq Thrust 15x7 application.
If it's any re-assurance I mounted, balanced, sold, repaired, warranty adjusted, installed, fitted and managed tire & auto stores/service departments when I was younger. All these places are still in business today because they did business the old fashioned way with respect for customers, integrity and honesty!
P.S. I know what the AR23 looks like too....Nice old school choice! So in short if you want a different look P225/60/R15 in the front w/ a 15x7 and a 15x8 w/ a P255/60/R15 in the back...I just got my camaro back after 2 years and hopefully I can start playing with it sooner rather than later. I hope this info helps you out...Happy Motoring and Be Safe!!