...as Jerry said, ...if it's a driver, you could easily go with the one piece rotors.
Since you mentioned your car is a '69, it may not be an issue, ...but if you use 1 piece rotors on a '67/'68 (ie. two piston calipers) you may need to turn the center hub area to clear the caliper. Again, ...may not be an issue on '69 (single piston caliper), ...but just thought to mention.