I have a '65 GTO, too but it has 215/70/R14 Goodyear Eagle ST on Rally 1's. It came this way when I purchased the car a year ago and these tires are old.
Have you looked at Coker tires?
I am interested in replacing them and looked at
www.coker.com and saw they have:
COKER CLASSIC 3/8 INCH REDLINE RADIAL
P215/75R14
Our price: $ 144.00
I am probably going to drive about 3,000 miles a year, also.
Are these the correct size that would have come on my '65? Is the Red Line the right size? Can I move up to a 225/75R14 on the rims I have?