104 octane for my 360 ?

So I'm back again for some needed advice . You Have not let me down.
Im racing this Sunday at a bracket event. I have a medium built 360, 9:5 -1 comp, tuned 850 carb , comp cam timing at around 34 degrees runs a little lean under 2,000 rpm but awesome at W.O.T. my best time on pump gas was 13.50 at 102 mph. should I get the vp 104 and time my car at 36 or run it as is ? (I Just got some slicks to if I can run them(SportsmanRules). I was told if I run the 104 and don't advance my timing it will run slower. What do you guys think.
Thanks for all the help
Dale

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