Use a vacuum gauge and dwell meter when you time it. I found that using a timing light on these older original engines can give a false reading. The vibration damper has usually slipped at least a few degrees, so the timing marks are off.
Set timing so it will have the most vacuum available from idle on, without any pinging on acceleration. If pinging, back the timing off just a bit.
Here's a quick read:
Quote:
Connect a vacuum gauge to a manifold vacuum source. Most engines will have a port at the base of the carburetor or throttle body where a gauge can be connected. Start the engine and observe the vacuum gauge reading.
Turn the distributor until the maximum vacuum gauge reading is noted. Back off one inch of vacuum from the maximum reading. Tighten the distributor hold down bolt. Normal readings average from 14 to 21 inches of vacuum depending on the condition of the engine.
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