Port Matching Manifolds, Throttle Bodies,etc

[StageZilla]

hey guys i spent a full day cleaning up the intake section between the throttle bodies and the head yesterday, smoothing and getting all the pitted cast shit off so its silky smooth (rb26 engine with stock plenum and 6 x throttle bodies)

when i bolt the intake section to the head, the head ports are alot bigger and theres a step down into the head ports of about 2-3mm all the way around. same with the throttle bodies onto the intake section and with the plenum onto the throttle bodies.

so the ports are getting bigger every time they meet the next flange, so is this ok, or is it worth matching them exactly? and how do i get the gasket to sit perfectly central as even with the locator lugs it can move around a few mm's? its like a 3mm edge all the way around so i'd be removing alot of metal to get em to match properly.

worth it or not? any other tips on cleaning up these areas?

cheers

Brad