Wow, Rick. Sounds like a fun car, and I need to see some pictures!
I've been out for a few days, so I apologize for not being on the ball like a millenial, haha.
As a serious answer to your question of tires, I have to ask if you are die-hard stuck with the idea of 15" wheels? There are many options available to you, and of course most of them are really expensive, but they will make a big difference in terms of performance, traction, and replacement cost. Please do consider changing your wheels to a larger diameter, and your width options will open up accordingly. 18's should still fit nicely on your car and allow you for a 9 or even 10" width, which will easily allow for 275 to 295 tires. 17's might actually be the best size to not rub too much, but they may not be the most cost-effective for tire costs any more.
If you really want to stick with 15's, I think a 295 is going to be your maximum fitment capability, but that tire is too wide to provide good traction on a 15x6 or 15x7 steel wheel. It will just balloon and smoke out a strip down the middle of the tire. There are plenty of drag radials or slicks available in 15" diameters, but you don't want to run those on the street all the time because they wear out so fast, and have not traction in any kind of inclimental weather.
I am of course making assumptions here because you haven't provided information otherwise, but I am thinking that you have stock ralleyes at a maximum of 15x7, which means that you should really be looking at a 245-275 at maximum width, and I would try to go as low on the side profile as you can endure for ride quality. I would probably have to suggest not going lower than 50-series, because those tires are half of your suspension. It might handle the corners better, but I bet your back won't.
I've been out for a few days, so I apologize for not being on the ball like a millenial, haha.
As a serious answer to your question of tires, I have to ask if you are die-hard stuck with the idea of 15" wheels? There are many options available to you, and of course most of them are really expensive, but they will make a big difference in terms of performance, traction, and replacement cost. Please do consider changing your wheels to a larger diameter, and your width options will open up accordingly. 18's should still fit nicely on your car and allow you for a 9 or even 10" width, which will easily allow for 275 to 295 tires. 17's might actually be the best size to not rub too much, but they may not be the most cost-effective for tire costs any more.
If you really want to stick with 15's, I think a 295 is going to be your maximum fitment capability, but that tire is too wide to provide good traction on a 15x6 or 15x7 steel wheel. It will just balloon and smoke out a strip down the middle of the tire. There are plenty of drag radials or slicks available in 15" diameters, but you don't want to run those on the street all the time because they wear out so fast, and have not traction in any kind of inclimental weather.
I am of course making assumptions here because you haven't provided information otherwise, but I am thinking that you have stock ralleyes at a maximum of 15x7, which means that you should really be looking at a 245-275 at maximum width, and I would try to go as low on the side profile as you can endure for ride quality. I would probably have to suggest not going lower than 50-series, because those tires are half of your suspension. It might handle the corners better, but I bet your back won't.
