Timing tape or just measure and mark your balancer(circumference divided by ten will mark 36 degrees etc). Lots written on it and very easy with a std timing light. 4 sounds extremely low for initial, I'm around 12/13.
Two biggest power gains I ever got were advancing timing on an old ram air three and adjusting carb linkage to fully open the secondaries. Two bonehead mistakes that woke the car right up.
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Chris D
69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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