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Building blazerstien

I have 93 fullsize blazer that I'm wanting to add a 5.3 and a 4LE65E. Need info on aftrmarket wiring harnesses to make it operate correctly. Also trying to add transfercase. Would also need some proper measurements to install engine/trany/transfercase.

You are going to be custom here. The 5.7L TBI motor and 5.3L LS based motor have really nothing in common, control wise. Wiring will be completely different as will the PCM to control the new mix. If you get the drivetrain from a newer truck complete (including the wiring harness and PCM), you should be all set to graft things together.

I am not sure why you would want to go to the 4L65E. If you were going to be swapping out to something different, why not go straight to the 4L80E and be done with it.