uvastang

i have a 93 mustang that had a 4cyl in it and i swapped it with everything in a 87 gt 5.0.... i swapped engine 5speed trans. and rear end... my problem is that the fuel pump is not running and ive found that the relay is in the engine harness for the 2.3L and the relay is under the seat in the 5.0... so i used a jumper wirer on my fuel pump and it runs... i tryed starting it but it just cranked.. checked voltage at the coil after pulling a spark plug that had no fire and the test light showed very low voltage at the coil... anyone have any ideas at all?!?!? or anyone ever done this swap from older to newer and ran into this problem.. im wondering how and where to wire in a fuel pump relay and why im not getting a spark.. thanks for any help in advance!!!