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I suspect that the most cost-effective approach would be to sell your wagon and use the cash to buy a factory-built turbo wagon.
Next best would be to pick up a complete turbo donor car-- ideally a running car that was hit from behind-- and move everything over. Different rads, different fuel pumps, different ignition systems, different compression ratios-- the list goes on...
There have been descriptions of conversions of non-turbo to turbo using the existing motor, but at 300K miles I am doubtful that it is the best approach. Custom fabrication typically brings surprises, which usually cost money.
Good luck!
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