Convert to front disc brakes from a '74-'77 Maverick/Comet or '75-'80 Granada/Monarch, and swap-in a 5-lug 8-inch Maverick Rearend. The 5-lug rear axels generally do not fit into the 4-lug rear axel tubes, so a complete rearend swap is necessary. You can still use your original center section with the stock gears. It is not too diffucult...
and by doing what T.L. says youll benefeit a lot more than just extra bolt holes. definately worth the effort