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OK, well I would get rid of that impeller in favor of the OEM impeller. You don’t want the engine to get ruined due to overheating, or have that impeller break and plug up your cooling system.
Why is it that you want to rebuild that fuel pump? I wouldn’t mess with it if it is working OK. Some of those pumps are rebuildable, but it depends on its vintage. Again I would not mess with it if it is working OK. These pumps usually explode into tiny pieces when disassembled, making it real tough to get em back together properly. 16:1 is a pretty heavy mix for this engine, which might explain why it smokes so much and seems rich at high speeds.
Nice work engineering a new cam roller!