I don't know of anyone on this forum has gone down the path you are proposing... as SG4247 said your best bet is to call up an experienced VQ engine builder. You'll get more answers in 10 minutes then you will in this thread over a month.
Even better, talk to them and report back what you find out. Next time someone is searching on this issue they may happen on your info...
I don't know much about engine builders (and building)... but I'd start calling around to some of the top tier Z shops like Z1 and Specialty Z... MAMotorsports has built some motors too and has a presence on this forum as well.
I'd recommend getting a ride in a 500+whp boosted Z before embarking on this journey (If you haven't already). You might find that the proven path will get you where you want to go.... It would suck to drop 20k for 400whp NA build and then get buyer's remorse the first time someone takes you for a ride in a forced Z.
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