There is no set timing for this specification.
If you are using a mechanical advance distributor rather than a computer you will initially target 35 degrees total advance over 2500 rpm with an idle setting of 10 degrees with out vacuum advance.
From there experimentation to determine most effective setting for your engine.
10 degrees with a stock cam
413
4.310
a Chevy 350 bored .060 over would be 360.4 cubic inches
No a 383 is a 350 with a 400 crank. A 350 bored 60 over is 361 cubes.
Depending on the piston type you are running, you would bore .030, .060, .090. Or, .020, .040. At .030, you come out to 355. So, at .060, 360.
The bore adds about 10 cu. inches to make it a 337
any Chevy 305 block can be safely bored .060 over. if you have a good block, with thicker cylinder walls, it might be .080 borable.
If my math is correct , just over 362 cubic inches ( 4 inch bore x 3.5 inch stroke , bored .060 inches )
468
388
a BOSS 414!