If you go EFI, you'll need all the wiring and upper intake components from a Mustang. Bronco stuff won't work. You'll then need to track down the front accessory setup from a Mustang as well. If going carbed, a little easier but you'll need to change out the fuel pump to a low pressure pump unit.
You didn't mention tranmission that you have, but the auto won't bolt up to the 302. If you have a 5-spd, if can be made to work but you'll need a bellhousing and possibleinput shafe swap. You should upgrade the rear end to an 8.8 as well.
You'll need exhaust.
You limited yourself to a few grand and dont have a complete parts car to use, and i can see all the nickel and dime stuff like engine mounts, bolts, accessory brackets, etc eating that budget up very quickly. $50 here, $100 there, stuff like that.