[Benzito]

Is the distributor going all the way down into the drive hole or whatever you call it? There is a hilt on the shaft that allows it to slide down far enough so that it properly seats on the cam.

Just another idea . . . loosen the fuel pump (you have to get at it from the bottom, I think) and it should slide over to the left. Then try to reseat the distributor in the shaft until it slides all the way in. I wouldn't tap on it - it should just go right in.