put some good octane in there & (1) set your initial where your cam/eng likes it (2) shorten the slots for 36-38 total (vac adv (if used)disconnected) (3) play w the spring combo so you get a fast a curve as possible but staying just under the pinging point as you run it thru the gears @ WOT on your hottest/driest day (4) hookup the vac adv & add as much of it as it will take without pinging (or missing from too much overall timing) @ PART throttle on your hottest driest day. Get each stage near perfect then the next one(& in order) so that nothing is being left on the table.