From my memory on this forum I have only heard of reminiscers and they are of the EA81S - the true twin port twin carb EA81 and the rare EA81T. And then there is Tweetys Tony who has done, what, the weber, the supercharger super slurper, and now waiting with baited breath for his EA82 mpfi.spfi pistons, cam and head worked and webered EA81 and it won't be a comparison coz it is in a trike !.
My own build to EA81 have all been fresher, tighter engines retaining fuel economy of the famed 78HP EA81. I think theory will probably mean if you go chase HP with these old dinosaurs , torque and fuel will be a compromise, Those 120 plus figures yeah, for high rev working planes so builders not looking or care about torque me thinks.
Not sure if I increased any HP on my EA82M and torque really shows its grunt with a load on board. Without a load just the other day I got blown away by a not yet 3 month old Kenworth tipper with a tare weight of just over 10 tonne ! Think he cornered better and just pulled away empty of course

it is a worry !!
Stroked EA81 .....nice idea, but who in their right mind would engineer such a low volume seller kit ? There, probably upset anyone googling stroked EA81 now :0 sorry