On my bench, tested on a 4.500 bore..... the cnc365’s flow about 385, and the cnc385’s flow right about 400.

I’ve seen the 385’s I had here also display some tendencies to have the numbers start to drop off/back up in the upper lifts(.700-.750), then they just kind of stall.
Not every port though. It seems like some are right on the edge of that happening.

A few years ago I freshened a set of original B1’s from Koffels that had what appeared to be their “stage 1” type of job.
Valve job, bowls, chambers....... flowed about 390@.800(really good for the amount of porting involved).