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i use synthetic fluid atf+4.in both my cars.9sec duster and 11 sec street strip duster.i think it depends on how much you race it.i run 2 classes,14-15 runs in a day.later rounds back to back.i foot brake and it seems my launch rpm stays does not vary as much when the trans is hot with synthetic fluid .
i have over $1000 in my transmission $4.00 a quart is not that big of a deal. 
Exactly, $1000 for a torque converter, $700 for a valve body, not to mention good clutches, steels and bands and you're going to cheap out on the fluid? Doesn't make sense.
For me it's not "cheaping out" as much as it's using what's proven to be a reliable fluid for 727s for 30 years for me. I don't ever remember a trans failure related to using type f in a 727. I do however acknowledge the fact that dino oil viscosity will be less stable with temperature swings than synthetics so the stall speed argument has some merit.
'65 Belvedere
'68 GTX
'57 Dodge pickup
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