Looking for Help with Tires

[H35]

I have a 66' Chevelle rag top and I just ordered a set of 18"/20" wheels. Now I need to find out which tire I can use in the rear that has the largest side wall.
The wheels are 20" x 10" and the car has Eibach lowering springs. I was thinking 275/35/20, can anyone post some pics of what they are using?

Thanks
Rob