Did it do this before all the new parts? Did you check fuel flow from the tank? Do you have a fuel filter on it? Could be a fuel problem, I wonder if it ain't carbon build up on the head hitting the valves? I'd check fuel flow first then double check your adjustments on the carb. If no ones ever been in that engine I'd say it's carbon build up. Once it gets hot it's putting the Valves in a bind. I'm sure Jon and Don have better advice, they should be along to comment soon.
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Brian
April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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