If you use the PI gaskets between the NPI heads and PI intake you will just need a small dab of RTV to seal the one mismatch...a few writeups on here if you search.
No but he port-matched the intake, ie. he made the holes in the intake bigger to match his heads better right? I'm asking if this would be a problem with my NPI heads. A normal PI intake will work with the gasket and RTV, but will a ported PI-intake work?
you would get non-smooth air flow with the transition from the intake to the head... some of the airflow would be stopped by the smaller ports on the head. Not good... Also in my opinion porting a plastic intake is a bad idea...