Been running E85 for a wile and did my own carb. Be careful with the QF kits as the metering blocks do not have a main well that big enough for a large motor..
With my 540 I have picked up almost .07 and 2 mph and cut my short times by .02...
I was running 94 jets with gas and now running 164 alky jets with E85.
There is more than just throwing the QF kit at it and seems that it likes less emulsion and smaller holes and also it works better with a 2 circuit carb conversion IMO...
Spark plugs are hard to read so be careful.. Price and the cooling effect is all a plus as in the heat of the summer here in NJ I would have 200+* after a run and a extended cool down time now it rarely gets above 190*..This is a plug with a lot of runs on it..
