One thing to remember is that the splash-oiler 235's will have the cam with the small-diameter bearings. It's basically the same cam core as a 216, but with a hydraulic-lifter profile ground on it. Original-equipment cams are getting very scarce, and I don't know if anyone is manufacturing new cams with that journal size. If your cam isn't badly worn, it can be reground to original-equipment timing and lift. If you can't find a suitable new cam and lifter combination with a hydraulic-lifter grind, don't discard that old cam core!
Jerry