RE-11's are still available from a quick look, 245 45 16 about $175 per tire. It may not be an ideal look for some, but I would not move to 17's if you change, really needs to be 18's. Econo boxes that are not stripped down even come with 18's these days and the tire manufacturers just are no longer supporting 16's and 17's very well for high performance tires. 205-225's for the Miata and import crowds, but nothing really wider for the muscle cars and RWD platforms.
1966 GT Coupe
Not much left original
Trying to do things once
MMI CO ~ Astro A5 ~ FiTech ~ MGW ~ AAW