I would say your total timing is good but your retarded at idle. I would like to see around 12 degrees timing at idle. You also might want to try hooking vacume advance to direct manifold vacume. That will give you more timing at idle without affecting total. Flex fan will probably do nothing for you. Also you might want to try less antifreeze ratio. Straight water cools the best. You can always add anti freeze when winter comes.
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