I LIKE multiple carb setups!
Having said that, AND read your parameters, don't do it!
With a perfectly stock engine, and dual stock carburetors, you can expect
(IF YOU DO IT PERFECTLY):
(A) a slightly smoother runing engine
(B) maybe 5 extra horsepower at wide open throttle
(C) maybe 5~8 percent better fuel economy
(D) expenditure of several hundred dollars
Now, if you are LESS than perfect:
(A) a rougher than normal idle
(B) up to 10 LESS horsepower, expecially at part-throttle
(C) up to 25 percent LESS fuel economy
(D) expenditure of several hundred dollars
If you want to change exhaust, cam, ignition, and go with smaller carbs; you could see better results.
But I would agree with the gentleman (Carl) suggesting the transmission change (to a point, don't know about 70 MPH pulling the stump
).
And given your location, I would prefer a single original W-1 over the YF. The reason is your location. The W-1 has a mechanical power system while the YF has a vacuum power system. On a truck doing towing in the mountains, the mechanical system is superior (opinion).
Jon.
