With as many cnc ported heads as TF offers, I’d be surprised if they didn’t have a few cnc machines.
Maybe slight differences between which machine did the porting?
The test to me would be similar to what Kaase did with his heads.
Test a “crappy” set on the engine, then do the minimum amount of work possible to at least sort of fix(or just improve)them, and put them back on and see what it was worth.
Obviously, if it was worth anything, I’d expect it would be worth more on a build where it was using up the heads and the hp/ci was higher rather than the opposite.
I guess what I’m saying is, I doubt it would do much of anything on a 450-500hp(or less) type stroker.