I would take the head off, and clean the carbon out of the combustion chambers manually. I would also take the oil pan off, and clean that out manually with some gasoline and a paint brush, (the same thing works for the valve cover), then rinse with water, dry completley, and re install with new gaskets. I recently did this to my ka24e valve cover, and I dried it in a 200 degree oven. There are these baffles in there that need to be heated dry. I stayed at 200 degrees to avoid warping it. These manual labors are superiour to chemical treatments IMO. But if you don't wanna take on that kind of work, I guess seafoam can work. Just follow the instructions.
Also, I would stick with a manual choke carb, because I'm a control freak. A Weber 32/36 would work. There are used Weber carbs such as 28/32, 28/28, 32/34, 34/34, 32/36, 38/38, etc... A 32/36 is the most popular and flows 300cfm, which is plenty. Of course you might have to re-jet it, but just get someone who knows what they are doing. there is even a how-to thread on just this topic...
zerothread/376140
Oh, your truck really only does 60? With 92hp stock?
Modified by seang at 12:04 AM 10/13/2009