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Here is what I have done so far on my 920s for my 273. I matched the intake and exhaust ports to my gaskets and smoothed the sharp edges of the spark plug bosses on one head. I plan on rolling the guide/roof of the ex. and smoothing the humps in the roof out the smoothing the whole port and bowl...

I recently bought a set of 920 heads for my 273. I have notice there to be more play with the valves in the guides then I feel comfortable with. I noticed some of the guides has rings in them, I assume knurling? I plan on doing gasket matching and some other work on the ports and bowls myself...