For my restored '69Z, I prefer the 100% stock look but I really like what you have done with your car - a very clean look and the rims and tires look great.
That's what great about our hobby...there are many different approaches to how we do our cars. Everything from outstanding attention to stock details to outstanding resto-mods, most of which can easily out-run my stock 302, with their aftermarket AC on.
When I am not showing my car, I use the Corvette 15 x 8 Rally rims (closer to stock look) with 245-60's on the rear and 235-60's on the front. They fit fine and ride much better than the original/repro stock E70 x 15 bias-ply tires. I think you can fit up to a 255-60 on the back. This is about as wide as you can go without rubbing. You will need to cross ref the new metric tire size and aspect ratios to what I have listed, and be careful with the rim off-set.
Since I was a kid I’ve loved the ‘67 – ‘69 Camaros but thought the wider Corvette Rally rims and wider tires give the car a more “muscular” look. Here is mine with its “cruzing shoes” on. Sometime I use the stock “hi-top” center caps, other times I switch to the ’67 flat caps that accentuate the deeper 15 x 8 rims.
Follow your heart…they are all cool!