Points Lube
I only use the correct stuff , there should have been a little capsule of the grease in the points box , it may have fallen out on the parts counter ? looks like an old timey " Contact " capsule but it has *just* enough Dist. Grease in it to do the job .
OReilly's , Pep Boys , Kragen , Shucks and so on all sell little foil packages of it cheaply , just go back looking for the capsule then ask for it if you don't find it .
Put it on the up side of the rubbing block so it'll work its self in as the miles go by .
Not much is necessary , a glop the size of a broken off pencil tip , if anyone still remember pencils in school

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Underneath the rotor are two advance flyweights , they have pins sticking up at each end , if the holes fr the pins are red , that's bad , wipe it clean and drop a couple drips of oil on each pin to keep them lubed up , this makes the power delivery smoother as the engine RPMs speed up .
Of the holes in the weights are egg shaped , just go get used ones from any old junker , the # is stamped right in and is the same for millions and millions of GM engines , even the 250 & 295 L6 engines use the V8 small block Chevy dist. weights .
I hope this helps , don't worry nor get excited , soon your old truck will be running tits and everyone will be impressed .