a turbo would not require an engine rebuild and it woudl cost waaayyyy less than a nortstar swap.
70k is young for any modern engine. since that motor is only like 9.2:1(from memory, could be wrong), you could easily stuff 8psi into it and have it happily hummin along for another 70k no problem.
all you gotta do is size your turbo properly and fab up some exhaust. NBD
the only thing you woudl have to take care of that is of any real level of difficulty would be reprogramming the computer, and that is not terribly difficult either.
later
tim
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