351 Windsor. Fords most well known V-8. its a 351 cubic inch (5.8 L) to compete with GM's 350 cu inch (5.7 L) V-8. That intake manifold allows you to buy and older motor that has carbs and convert it to fuelie (EFI) to maintain the stock Mustang look and mechanicles. So your uncle would first have to get a 351 winsor swapped in and then use that manifold to switch it to feul injection.