The Situation: 360 Water pump

And since the 360 came out in 71, and was externally balanced, you wont find an old style damper to fit it. You would need to re-index the tdc mark on the current one for the old style cover. But wait, that engine already has the old-style system on it. So what balancer did they use and more importantly, hows it run, and maybe they already re-indexed the damper?
-In any case; yes its a can of worms. I did the conversion, because I had all the matching donor parts. I now have the 70 and up system in my 69 Mope. At the time it was the only way to put the hi-flo pump on it. IMHO its the best way to go, but definitely a can of worms.