Need help and advise on valve adjustment with non adjustable rocker arms & shaft

on a general rebuild,which sounds like what youve done, you shouldnt need to. now if you have had the heads cut the block decked u might want to set up a dial indicator and check how much preload your putting on the lifter. most all makes should be between .020-.080. personally i like them on the looser side. if im not mistaken, i think you can use the shafts and rockers from a 273 as they are adjustable due to those engines being factory equipped with mechanical cams. hope this helps and anyone please correct me if im wrong mt