Engine Truck 5.0L into a 69 stang

look into a stand alone engine managment system. after that, you just need the o2 sensors and fuel pump i believe. Lots of info out there. If you want to stay with factory parts, you'll be happier with stuff from a fox.

you'll probably want to swap the cam, this will change the firing order as well.

You will have to get an ECU to match if you intend on keeping EFI....but you don't have to keep EFI anyway, can always just swap to a carb intake, run a carb and a distributor that is carb friendly and it will work just fine...not to mention, the EFI manifold for a truck probably wont fit under the hood(at least not easily) so at the very least, even if you keep the EFI you will likely need an intake manifold from a car(mustang, crown vic, etc) and if you are swapping the intakes anyway then carb is worth consideration. The question you should ask yourself before buying anything though is why you want EFI, and whether a factory-style EFI is the best way to accomplish your goals.