Best wheel and tire set up

[Oilking53]

Hello everyone, I’m new to the form but I have a question for y’all. I’ve been doing a lot of research but haven’t found quite what I’m looking for. I have a stock 77 280z and I’m wanting to do some very minimal mods. I’d like to lower it with springs and put some new 15x7 Rota grid wheels on it. My question is what’s the biggest tires I can fit on those wheels with lowering springs? I think 215x60r 15 would work but what about 215x65r 15? Thanks for the help!!