Igniton kits galore, 5.0 transplant kits galore but on a 5.0 you will spend some dollars and you have to be a fairly good mechanic to do this right. you will need among other things - a shortened driveshaft, stronger coil springs, upgraded brakes, special
trans mount, new radiator, different motor mounts, conversion wiring just comes to mind -oh yeah - new fuel system with fuel return lines in addition to vent line
I'm not saying this is impossible, lots of poeple do it but to be done right so you dont have a poor running engine(where you are right now) it takes time and money. Take the money and buy a 86 to 90-- Mustang and you will be so much happier. just my $.02