What is it with some people..

Shoot.. I remember that guy. Lol
Yeah that was interesting.. to say the least.
I saw something the other day where a guy was doing a re ring kinda deal and used a small piece of stone or something to surface the head. There's a very strong lack of understanding going on in the world.. thats for sure
I've gone over a head & block with a piece of wet/dry on a very flat piece of hard Maple(a very stable hardwood), very lightly to clean it before checking it with a Starrett straightedge & feeler gauges to check flatness. But I wasn't fooling myself into thinking I was 'Surfacing' it. Some I did have surfaced. Flatheads use such a thick gasket that Copper Coat will seal them if not too far out.
Also 'Eagle Machine Company of Indianapolis', now defunct, built a portable boring machine in the late 1920s or early 1930s that bolted to the head studs of period engines, and after indicating to each bore separately you could bore or hone the cylinders as needed. A hone job & a piston knurling would get you back on the road back then. For a while!
So that concept has merit, just not for today. And a drill press! Please, not stout enuff.