Just an update on things with the 460. I had the carb off one more time. This time I cleaned it and ran a wire through all of the passages, and I visually inspected everthing and there are definitely NO blockages in there. I set the float level to 1 5/16" (it was just about there anyway), and set the main jet to 5 turns out. I also drained the gas tank, removed the sediment bowl and gas line. The sediment bowl and filter screen in the top of it were very clean. The screen that goes into the carb. was spotless. I purchased and put in premium grade gasoline (93 Octaine I think) and I put an extra turn on the manifold heater spring. I couldn't think of anything else to do, so I turned on the gas and fired it up and guess what? It's exactly the same as it was before......stalls under load or if you gun the throttle. I did notice with the manifold heater flap staying closed a lot longer, that when I gun the throttle (by pulling the choke partially out) the external counterbalance weight moves as if exhaust gases are pushing on it from the inside. I think that would indicate the flap is definitely still there.
My conclusion is.....there has to be something wrong with the carb. I don't see any signs of modifications or alterations inside of it, but who knows what might have been done to it or swapped out of it over the years. I'm going to replace it with another carburetor. That way I'll know for sure. I don't see any other options right now.
I'll let you all know how it turns out....good or bad.
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