Sight unseen

[FMS88]

You've made good headway. Without removing the radiator cap, periodically check the coolant level in the overflow tank when the engine is cold. If the level doesn't decrease, the coolant system is tight. Same with the oil level. A puff of smoke at start up is an indicator of worn or (34 yr) old valve stem seals. But if you don't need to add oil more than 2-3 times between changes, the seals can wait.