Anyone have the original coolant recovery tank for 71-72? Mounting issues (help!)

[71CHEVYSHORTBED402]

I bought the dealer installed kit (994230) and am running a test fit. Should mount to the radiator support, above the horn. (pictured). Link is: https://lh3.googleusercontent.com/CS...Y=w800-h600-no

First, I don't see how you can mount the bracket of this centered (width) with the radiator support. Not necessarily a problem.

Second, if the tank is too high, it hugs the top side of the radiator, and I imagine it would burn up. If it's lower, then the nipple on the bottom of the tank is intermingled with the connector for the wire harness to the horn. The horn only mounts one way.

Are the radiators wider on the big blocks? It's not quite the right radiator, and am getting another, but I don't think that's the problem. The widest part of this radiator is 34 1/2". I know the core support bushings are bad, but can't imagine that's it.