I am going to install a 97 model 5.7 Vortec into my 86 Suburban. Has anyone performed a similar task. I have the computer and underhood wiring harness. As part of the transformation I was looking to change out the factory tank for a newer model with a built in fuel pump. The other option is to install a frame mounted pump. Does anyone know the pressure required for the Vortec fuel rails? I was also told that there were only four wires on the computer harness that I needed to supply power to. If you have done this, I would like some feedback prior to tapping into the harness.