Timing question for a 383

Its mildly built,, bored 40 over,keith black eliptical dome pistons with valve cut outs,comp cam part #21-222-4,,,,grind #crb xe262h-10,,,intake valve lift.462,,exhust lift .470. eddy performer rpm,,ported and polished 906's,,holly 870street avenger,,and engine is balanced,,Auto tranny.. It has electronic mopar distributer and wil have a msd6a ignition box..Its sitting on the stand with the rotor pointing directly at the #1 cylinder wire withthe timing mark bang on top dead center,,NOW the qustion,,where is the best starting point to set the timing for first time start up
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