Removing 1967 273 Dipstick Tube Without Damaging It?

If it need to be removed from the top, I just put a tapered punch in place of the dipstick, wrap some electrical tape around the end of the tube, grab it with some small vice grips and twist it out. This assumes the tube is in good shape. If cracked, it will probably break off. Then its either tap out from underneath, or, run a tap into it and remove it that way. New ones should be available depending on the length of yours.