What doesn't line up? The bolt holes are all the same, and if it is really a '69 318 (and not a later year 318 that was transplanted into the '69), there should be no differences with the water pump. If it is a later year 318, the aluminum water pump (Passenger side inlet) is a bit longer nosed than the proper iron water pump (driver side inlet), some of the mounting surfaces on the aluminum pump may be at different depths, and the pulleys/belts won't line up. In that case, swap on the 273 parts.
