[sjf911]

The simplest thing to do is to buy someone's complete, running 930 motor and swap it out for your 3.0. You are faily limited in amount of boost and horsepower gains by the stock compression and lack of fine control on fueling and timing with the stock SC CIS.
EFI conversion, especially utilizing a 3.2 intake, lends itself nicely to turbocharging but may not be any less expensive than an engine swap in the long run and leaves you with a system that is under capacity from an oil scavenging standpoint especially with an oil cooled turbo. G35R's or equivalent may help this.