[Walt Fricke]

I'm not sure the 3.2 intake is a good candidate here, unless you have one sitting around and that saves $. One hears that it does not do all that good a job distributing the air from the single throttle body.

Don't know about the 964 intake, but look up the Spec 911 rules (mostly a West Coast racing class, but also adopted in the PCA Club Racing rules), which make a provision for using this as one option. The notion there is that the various configurations allowed, plus some weight adjustment, creates equal performance.

The late Euro SCs (big intake ports, big runners, 9.8/1 CR, and a good exhaust) tend to outrun the 3.2s in racing despite the displacement and EFI advantage the 3.2 has. Though the 3.2s have the same cam as the SCs, so aren't taking advantage of the EFI in that respect.

Twin plug is always nice, and with it you should be able to run 10.5/1 CR and certainly the S cams, if not something even hotter.

A lot depends on the use, and if for racing, what rules allow.