If I was in your position, I would tear down both motors, send the best block and heads to a good shop for machining/refreshing, then rebuild one good motor with best parts from both motors.

As stated prior, cheap/non-running BMWs usually end up costing more in the end then fair priced/well sorted ones.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!