California Emissions Junk

[CRIChouse]

Well, phooey on the turbos. Two are completely seized; the other two have so much play I'm surprised they stay together at all. Assuming my stock turbo is good (minimal play, but it could be leaking oil. I've yet to diagnose), what should I do? Leave it alone, rebuild the wastegated types, or replace with something newer and nicer altogether?

As for the two blocks... well for starters, they're so filthy that it's hard to tell what's going on, but they are not the same motor as mine. Funny enough, they have *more* stuff on them than mine.

Peripherals arranged differently (PS where the alt is; alt who knows where; AC bracket elsewhere), one has a different intake manifold shape and EGR (mine doesn't have this at all), both have some funny doohickey on the back of the manifold that doesn't go anywhere, and other minor differences in the block and head castings. I wonder if one is a 4D56? Are there any serial numbers or other identifying marks I should look for?