Port shape is more important than port size.
We recently built a 3.0 MFI with DC80 cams, MFI 10.5:1 Twin plug that made 305 DIN @ 7200 and flat torque curve from 3200. These are 3rd party turner numbers not our numbers. This engine runs Supertec Venti-port 36 mm intake ports.
Some ports will restrict high RPM but truly how often are two valve Porsche engines turned much higher than 7200-7400.
The DC 40 cams will be well done before 7000rpm.
Stay small and enjoy the derivability.
A quick note: We recently built a 4.0 liter with DC40 cams that spins the tires in third gear. This engine runs 3.6 C2 heads with ports reduced to 40 mm from 43 mm. At first we thought the clutch was slipping.
