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...but would it make sense to buy a Jasper Starion engine and go from there?


Only if you want to spend a bunch of money and then try to rebuild it again later. Or to put it differently- no.

You want to find a donor car if at all possible. First step is to read the Turbo Bible Thread.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com