Then keep the '87 IP, it matches the shift points. I would prefer the '87 trans if I were putting in a 3.0 / 603.96x for that reason.

Install the '91 head complete with glow-plugs and injector nozzles, and the injector hard-lines from the '91. As Sixto mentioned, the two (longer) bolts in the chain cavity should stay with the '91 head also.

You will use all of the existing wiring and plumbing in the '91, will connect to the temp sensor on the '91 head and use the '91 afterglow-rated glow plugs that are already there. Perfect.

Your '91 turbo should stay in the '91, it doesn't have the ARV but it does have the pressure-wastegate, exactly what you want regardless of which trim wheel it has. The '87 turbo won't physically fit because of the ARV IIRC, longer on the compressor intake side.

If you're considering re-sealing the front (chain) cover, consider the front cover from the '91, I believe that it is the later (stronger around the tensioner bolt) design.

Either pan should work, I'd stick with the '87 pan as windage wasn't a significant problem with the 3.0L crank.

If you end up with an extra belt tensioner or good extra vacuum pump let me know, I'm interested.

__________________

Gone to the dark side

- Jeff