This wont be of any help to you...... But......

Before the Chapman stage 6's arrived on the scene, MP offered a CNC ported version of the std stage 6.

I have what I believe is a set of those here in the shop(they have been CNC ported with a pretty coarse program), and fwiw...... They don't flow anything special as they came ootb.
I would consider the porting that was done a nice head start on getting the bulk of the major "hogging" out of the way.......... Other than too much was actually removed from the exhaust floor.

https://board.moparts.org/ubbthreads/ubbt...tml#Post2210676