Just a few lol. A good number of years ago I milled an 848 head .125. Sounded great on paper, looked impressive in person, ran fine, but what a mess getting the rocker arm geometry back in order. .050 .060 is half that but still likely to require sinking of valves, lash caps, valve spring shims, shaft shims. Like I noted, get some really good pistons. I know they can be expensive, but in the end, you will be much happier with the torque and power then you would be cobbling up the valve train to get a bit of compression (which does wonders for these motors by the way).

Mike