I have an extra turbo motor from an 83 laying around that needs bearings, possible machining on the crankshaft, clyinder sleeves and maybe pistons and rings.

I am considering putting this motor in the 77 if the motor in the 77 needs some work. I prefer design of the turbo motor. Some of my ideas include putting this motor in without the turbo and swapping parts over from the 77 motor to the turbo motor, How much is this possible?

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)