After valve adjustment stall issues.

You're not going to make it stall out "just" adjusting .010 and .020. That ain't what did it. You have some too tight because you accidentally adjusted some off the base circle. I have mine adjusted at .008 and .010 and it runs fine. It's a custom grind Oregon cam though so it's a kinda apples and oranges thing. The specs for it were .020/.020, but after consulting Ken Heard, who ground the cam, he said it could tight lash with no problem. I did that to help lower cylinder pressure just a tic fighting detonation. I can most likely adjust it back loose, as other mods I did got rid of the detonation.....but I probably won't, because it runs strong as hell.

The way I've always adjusted valves is one at a time. I get the valve all the way closed and turn the crank about 10 more degrees. That puts the cam slam in the middle of the base circle every time. I don't use the EIOC, or ABC, or LGBTQ or whatever the hell it is, because it's too much for my mind to keep up with, so I do them one at a time. Been doing them that way over forty years and it works for me.