Dave, I know its a little to late now to bring this up for your purposes, but since the engine ran with the old, un-rebuilt carburetor, it may have been a better plan to wait to rebuild the carb until after you break in the cam of your new rebuilt engine. It is a PITA to have to fiddle with carb adjustments while you are trying to run a new rebuild at 2,000 RPMs for 20 minutes right from initial start up to break in the cam properly. You can ask me how I know this, as I made this same mistake. Fortunately nothing bad happened, but it sure was nerve-racking listening to the clattering valve train, and fiddling with the carb to get it to stay running for twenty minutes. You might be fine with yours.
Carl
Carl
