What is the widest wheel and the offset and tire that will fit on the rear of a 1970 nova without any modifications?

For a 1970 Nova, the widest wheel that can typically fit on the rear without modifications is usually around 8 inches wide, paired with a tire size of 245/60R15. The recommended offset for these wheels is generally around 4 to 4.5 inches. However, it's crucial to verify fitment based on specific suspension setups and other factors that might influence clearance. Always consult with a wheel and tire specialist for the best fitment options.