you said it will idle fine if you take out the spout connector and unplug the IAC?
re-check your timing with the spout out, get it at about 14deg initial. Then plug the spout back in. Now remove the IAC and clean it with carb cleaner (or replace it).
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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