Keep in mind, Shimano's sealed BBs are symmetric. Some of the older cranks back then used asymmetric spindles. Confirm this before purchasing a sealed cartridge BB. Maintain the drive side spindle spacing.
+1 A lot of the old ones were not symmetrical. Look closely before you buy. Keep all of the old parts as you might need them later (or be able to trade them with someone on the list for something else you need).