[Kurt in NJ]

If the engine sat for 20 years there probably is a lot of sludge in the bottom of the pan ---many times I have been told when looking at a engine that sat that the oil was clean on the dipstick---this is because all the "dirt" settled out, many times enough to cover the oil pickup

most likely both cam and crank gears should be replaced, if just replacing the cam gear use the fibre one, other gears will work but the fibre one will get used to a worn gear and make less noise, I have the alum gear that was replaced with the crank gear-40 years of use--it runs so quiet I can hear the points opening--closing