Think I second the vote to reco the 4.5. Could do some head work and get some more hp. Otherwise build it to suit a turbo then your laughing. Ive done engine mod swaps and it always costs more and things don't work or come together easily. As said before don't forget extra insurance and engineers costs.
Might cost a bit less if you can keep some parts that are still okay with the 4.5 rebuild.
230k isn't heaps, mine has more ks. My gas consumotion is about the same. What makes you think it's on it's way out?
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