Ron, I did a bunch of reading. I will say that it was hard to separate fact from opinion. I got a general "concensus" that the Canton was capable of significant more flow and less restriction due to much larger internal passages. The Canton unit is also actually -12 ports on the unit, which you can either stick with -12 or reduce to -10. I found some info on a Factory Five Cobra forum as well as some other places.
I am very concerned about restrictions, and that was the reason I went ahead with the Canton. Frankly, either would probably work and there are probably minimal differences - other than the Canton thermostat is 215deg and the Derale is 180deg. For my purposes, I would prefer the 215deg. I don't want to be cooling it when the oil is 185deg.
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