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Optimal Timing?

I'm about to set the timing with a light, instead of by hand (as I have it now). Any suggestions for a good setting?

The original plate on the car says 6 btdc. But my engine is modified.

Holley 750cfm

MSD 6AL & MSD Billet Dist

Crower Cam #15242 specs:
grind: 280HDP
lobe center: 112 deg
advertised duration intake: 280 deg
advertised duration exhaust: 286 deg
duration @ .050 intake: 220 deg
duration @ .050 exhaust: 226 deg
gross lift intake: .526"
gross lift exhaust: .540"
rpm power range: 1800 to 4500
redline: 6000+

ttyl
Roydon }8-)>
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