Jon,
The factory distributor for a single 4 barrel carb should have 15' of timing- that would be 30' as you measure it on the crank with 2-1/2' initial advance, and "all in" at 32'. I recall you should be able to get about 20' of vacuum.
Check for vacuum leaks! Those old hoses do have a service life that has long surpassed! If you haven't replaced them yet... go for it. I think you (and your grandfather) got your moneys worth.
Check your points (if you haven't yet converted to electronic) Gap should be .016. and replace all your typical tune-up stuff... Plugs, wires, cap & rotor. I would have thunk these would be normal items to replace at a rebuild but just checking... Plugs gapped at .032. Speaking of which... what kind of plugs are you running? Pull your plugs and check if you have any that are wet or fouled etc... Are you misfiring or running rough or just a general lack of power?
There could be a lot of other things at play here, but want to answer your question first. Here are some other thoughts to bounce off you...
Did the engine get "broke in" correctly (piston rings not sealing, wiped out cam)
What cam was used in the rebuild? (something different than what Grandpa had in it or thought he had in it?)
Did the carb get rebuilt? Perhaps it's due. Even just a good cleaning can make a BIG difference! Old gas that sits in them can laquer them up even in a short order.
Erik
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