What and where to clean up Edelbrock RPM's?

So I bought a set of RPM's for my 340. I have the stock above deck pistons (they are TRW Forged replacements) so I purchased the ones with the .060" cut chambers. I plan to measure all 8 pistons to find the highest ones and mill the heads to get .040 clearance with head gasket. I also plan to replace the spring to match my Lunati 60403, have a valve job done and everything checked out before I run them.

I've read these heads need cleaned up to flow better. I have ported heads before with good success, but always with someone familiar with the head to outline what needed done. This is a street engine so I'm not looking for a full port job, just clean up and minor correction if need be. My plan so far was gasket match, flash clean up and check the throats.

Any advice pertaining to cleaning up would be appreciated.