Nothing wrong with vacuum wipers if they're in good shape. Usually send mine to Ficken in New York or Clean Sweep in Oregon. $65 to $75 and they work great. American Motors used vacuum wipers way up into the 70's maybe 80's and people didn't even realize they weren't electric. One thing that will affect these wipers is if you do away with the original gearing and go to highway gears in the rearend or an overdrive transmission, then the engine is under a pull more and vacuum will drop compared to the original deep geared free revving factory setup. American Motors combatted this by using a dual diaphram fuel pump where one side pumps fuel and the other vaccum so being under pull has little effect. This type pump used to be available for most engines.
