Believe it or not this is how I set the timin. Way back when, when I was runnin my little slot car, Datsun said to set the timin where you think it should be, get in the car and get it to 30 in third gear and get on it. If it rattled, to much advance, if it didn't not enough advance. Now this doesn't work very well for an automatic but the principle is still the same. Just how I do it, cuz if you just set it to a number someone suggests and forget it how do you really know it's advanced enough for you to get all your engine has to offer. Just my HO. Good luck to y'all.
Allan