The amount of timing advance is different for the different computers used in the 5.0L mustang. Pulling the spout out gets rid of the computers ability to control timing, so this is why you set your timing at total with the spout out, and leave it out.
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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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