Resale be damned, a turbocharged 964 or 993 3.6L is a fantastic, awesome engine with an enormous power band. Quiet valvetrain, smooth, responsive, durable. Sure, quite a bit of fabrication, but what's not to love about the results?
365whp/370wtq @ 0.5bar
450whp/460wtq @ 0.9bar
520whp/550wtq @ 1.2bar
(budget minimalist version for track)
If you could drive a 964 with an RCT-style engine, or a plain all-stock 964, what are you going to drive? :-)