The most impressive small saw at the CT GTG was a Hooskey 350 with that there 45mm Hyway top end on it.
No chamber work, it was pulling 200 psi with squish adjust by base plate machining. IIRC, passages smoothed and gaskets matched, but no timing change.
Handed my 16k MS260 it's lunch, as well as a bunch of 346's-modded and unmodded.
It was MattyO's.
The point here is that this particular AM jug isn't cheap but can be made to run.