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IIRC 606 na has sodium filled valves and squirters. Pretty sure there are a couple people running in the 250-300+hp range on NA. Would definitely need a turbo pump (not hard to find). The intake valves are smaller on the NA, but exhaust is larger. If you don't mind doing an engine swap, starting with NA is a good way to shake out all the design decisions and drivetrain issues.
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