To Port or not to Port

[JohnJL]

I'm having second thoughts about this step in my build. Would appreciate some comments from people with similar or tangential experience with a similar set-up. Knowing a bad job could actually reduce my performance and that it is expensive, will I see any measurable improvement in torque/hp at mid-WOT?

Here's my setup:
3.0 9.5CR JE Pistons
GE20/DR20 Cam from Dougherty
Megasquirt injection and EDIS crank-fide spark
Injectors mounted in CIS runners (may widen the bottoms here also)
SSI

Track car, hoping for 220HP

Based on some interpolations from factory specs/lists in Wayne's book and posts here, I was thinking I would want 38MM for both intake and exhaust. Can anyone chime in to endorse/dispute the need for work here. These are US-heads, with 34 intake, 34 exhaust (from memory). THe runners have ID of 33.5, but can be widened at the manifolds significantly and thought they should roughly match the intake (with perhaps some overhang as Steve suggested for reversion-suppression?)

Thanks

[randywebb]

not if you are using a GE20 -- just clean up any mismatches

[JohnJL]

Randy, thanks fro your input.

Seems like engines of similar displacements/more aggressive cams and with higher-range hp(than the stock CIS) all had larger ports tho...was that unnecessary?