Goes w/o saying besides having round cylinders, the cylinder finish must match the ring material for them to break in the best, or in some cases- at all. Moly breaks in quickly, plain cast iron takes a bit longer all the way out to chrome faced rings that can take a good while to break in.
Octane will not have any real effect on blowby, just be sure there's no detonation- and w/those timing figures and 93 octane there shouldn't be detonation unless the cam has a way-short intake closing point. I don't want to get sidetracked w/timing, but unless you have fast burn chambers the max power total timing will probably be found to be closer to 36º. Aluminum heads will usually tolerate a bit more timing (more doesn't always mean better), but given the 10.5:1 CR, let the signs of detonation be your guide.