273/360 parts swap question question

My 67bcuda that I just bought has a 273 water pump on it. seems to work ok, idles at 190 in the driveway with no shroud. It also has the 360 dampener on it. timing tab/marks are there but probably a ***** to read with the hose in the way.
not sure on the 65 cover. I have never heard of any difference there.