SM Head Modifications on a budget

The question I can’t answer at this point in time is…….wrt the SBM RPM head is…….
If you did nothing to the head other than cleaned up the port openings and blended/radiused the pinch area……..is that worth any flow?
When I’ve done it to those heads it was part of a bigger job, and I never isolated that part of the job to see what/if it was worth anything on its own.

Basically, I’ve found that small changes made to performance aftermarket heads result in……. small changes in flow.

Conversely, I can spend 20 minutes on a stock BBM 440 346/902/452 intake port and pick up 30+ cfm.