Re: Knock, knock
Seeing you changed the cam gear I would run a cam gear test. Take a 1/4" dia. wood dowel approx. 2 " long and round of one end so it looks like the timing pin used to time the distributor. Remove the timing pin and start the engine. Pay attention to the fan. Slowly insert the wood pin into the timing pin hole until it rubs against the turning timing gear. Apply a little inward force on the pin and note if the knock changes with the applied pin force. If it does this means either your timing gear nut is loose or the gear needs replacing. If you replace the gear I like to use a one piece fibre type.
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