Not sure what you are asking, but the '85 block should drop right in with all the '92 external parts. There may be a difference in the motor mounts if you're going from a 2WD to a 4WD.
If you are asking about using the '85 EFI bits? Intake manifold and Throttle Body are different, Injectors are different, EGR is different, Air Injection is different. Yeah, it's best to plan to keep the '92 external engine parts.