While it is very common to port match an intake manifold to a set of cylinder heads to ensure that there is proper port alignment so that the air /fuel mixture can enter the intake side of the head ...

1) What is head porting and polishing and how does it work?Porting involves shaping and/or polishing the intake port openings, the inside of the ports, the exhaust ports, the bowl area below the valve ...

So you've port-matched everything on your Pontiac motor and it's still not running up to potential. Your intake manifold could be installed incorrectly. Because ...