I may be wrong but I don’t think you can you have an 8″ wheel with both 0 offset and 4.5″ backspace. Need an expert here.
Could easily go with a 7″ wheel for 215. That’s what I run on my 64 El Camino. I think 215 is the smallest size for an 8″, very straight sidewall will result, probably good for handling, maybe firmer ride.