I would do the homework to determine that the turbo head won't significantly lower compression ratio when installed on a NA engine. You don't want an engine that is slower than the current engine.

AND a turbo would certainly be an upgrade. Isn't an engine swap considered maintenance on a 25 yr old vehicle?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.