voltron_boi

I just swap out my rb25det from my 75 280z. I just install original l28 back into the car. Connect every wires to it's original location, even install back the oe fuel pump also. This morning before going to work I try starting the car, and their was no click on the efi relay. I got a light tester and check all main power connetor and got power. Came across a four wire(2 white 2 green) connectors under the dash from coming from the engine harness to the computer. There was no power from these wires! I then trace the power wires from the 4 wire and wire the 3 power wires into the key igintion wires and wire the last wire to the fuel pump singal to the original connector. Turn on the key and relay click but cannot start-up. I then disconnect the fuel pump singal wire and started it agian. Finally it fire up, but only for ten sec, n it died. Gave it another try and did the same thing. I think the car is lacking fuel from coming into the engine. I'm out of ideas now and don't no what to do. So anyone that had or have experience please give me advice and help out?

I just pick up a early white 74 260z. The owner had sold the motor with transmission, and everything else is still attach. The other day I just pick up an full swap from n/a 75 280z that came with engine harness, computer, amf, intake plus intake box. I know that almost everything from the 75 will bolt into my 260, but not unsure if the 75 harness will bolt into the 260 since it's a carburetor setup. I was talking to my friend the other day and he told me that I will need to wire the ignition wires from the 75 harness into my 260 ignition, then will need to wire up the fuel pump, then I should be able to start the car. I have search and seen many for the l28et swap, and nothing so far about what I'm looking for. So anyone, please confirm if my friend is correct? Plus anyone who experience in the swap or know any information about it, can please help or direct me to a link that will answer my question. I just want to get my facts straight before I start the swap. Thanks