Need help

[Badazz Z71/superduty]

I have a 2001 GMC 1500 Z71 that I let set up for the last 2 years while I gathers the parts and the time to build. I put Dana 60's on the front and back with about 18" of lift to the springs. When I finished I drove it for about 6 months then the trans went out for the 3rd time. Determined to solve all the problems with the drive train of the 1500 I threw in a built turbo 400 behind my stock 5.3. Not that it is all said and done. I have tried to get my baby breathing again for about the last month. Changed the fule pump and filter, took out the injectors and soaked in seafoam for about 3 hrs cleaned then replaced. Changed spark plugs and checked for fire everything good. Fule pressure at cranking is at 62lbs, saftey neutral switch set to park position and no breath????????!!!!!!!! She will however stay running on either but will not start on gas. Does anybody have any clue what could be the problem???? All the fuses and relays are good have checked everything!!! It should crank but does not