No one can give you definitive answer based on that info. But a good starting point would be 8 to 10 degrees BTDC at idle, with additional 24 to 26 of mechanical advance, all in by 3,000 rpm.
You should also use the vacuum advance. I use "manifold" vacuum, which has vacuum at idle. Some guys like to use "ported" vacuum, which has increasing vacuum as engine speed increases. Experiment with the vacuum advance to see which works best for you. Limit the vacuum advance if it's pinging by getting an adjustable vacuum advance unit.
Thanks, I am new to chevys. Timing pickup connected to left front cylinder. Correct? So at idle with vacuum advance connected it should be 15 degrees or so? I believe this is above the scale on the timing marK? Mine seems to run better when the mark is significantly above the marker.
On a warm engine, disonnect and plug the vacuum advance, then set the idle to about 7-900,..whatever she likes.
Then set the initial timing to about 10 degrees as stated above,..recoonect the vacuum advance, then drive her. If she doesn't knock or rattle (most noticable when you stomp on her at lower rpm), then bump to 12, etc.
When you find the detonation point,..or pre-ignition, then back her back down a bit, and lock down the dist.
Fyi,..my cars all like around 15 degrees (+/-),..I run 93 octane.
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