This one has been pretty close from my experiences
http://www.rbracing-rsr.com/comprAdvHD.htm
I think many engine builders aim at 185 max with aluminum heads for 93 octane? I ran my old motor at 195 (193 to 202) on sunoco 94??
Iron heads maybe 160 and attention to any sharp high spots that can glow is a must!
Tryng to get this JWD closer to 190 I'm at 160 low now and 170 high was at 150 low and 160 high so advanced the cam 4 more degs??