the best way is to experiment a bit. I use a timing tape, & try to shoot for a 34-36 degree total, all in around 2800. An additional 10-12 degrees on the vac can should be pretty close. Your comp ratio, coupled with a fairly mild cam may be why it likes a little less timing. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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