How to set timing for initial start up on new build?

MoparMike1974 said

So I should set timing mark to 40° then force the dist advance forward while setting the dist. Is 40° total generally ok for a mild 340?

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No, but it is good for initial start-up and break-in, depending on the head chambers and compression it could be anywhere from 31 to 36,...it usually falls around 34........
They've pretty much got You covered on this, if You've already run the ign. and nothing has changed, make sure everything is wired & connected tight, grounds incl. If it's
new or new to You components, test the coil output for spark by hooking up & giving the dizzy a little whirl. As stated, You don't want Her cranking 1st, & diagnosing 2nd!!