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Well I am running 18 degree advanced and have a shroud with 2 14 inch fans and a 192 thermostat.

You suggested going up 1 or 2 jet sizes, is that on primary or both? What makes you think it is too lean??
Are you running it 18* initial or 18* advanced?
Should be 16*-18* initial,with 18*-20* mech advance (all in at2600-3000 RPM) totaling 36*-38*.Running low timing will cause an engine to run hotter.I would also change to a 180* thermostat if it were mine.
 
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