Distributor question

Have a question about a distributor that was removed from my F block 455 and replaced with a HEI...the old one is a points distributor with vacuum advance has a number on the side that is 982-3C2, preceding the first numbers is a row of either vertical lines or ones, anyone recognize these numbers and secondly will this same distributor fit a olds 350? My son is looking to replace the current HEI distributor on his 69 Olds 350 with a smaller diameter distributor so that he can use his stock air cleaner, currently won't fit with the HEI that is on it.

Thanks