Steve: I'd spring for a new harmonic balancer while you are at it, they will come apart on you from age. I forget if the 460 is rubber bonded like the 302, but I had the one on my 302 come apart on me and the thing shook like mad until I changed it. You can pick up an SFI approved one pretty cheap these days, and it is cheap insurance. While you probably won't be buzzing that 460 at high rpms, you will still be getting on it occasionally, so heavy duty parts always pay off IMO.

One of our resident experts, like Paul Kane might have some different thoughts on it, so maybe he, or some of the others, will see this thread and respond.

As for the aircleaner fitting, if your new one doesn't have it, no problem, just plumb it into any vacuum port on the manifold or back of the carb. You can use Lokars stuff for not only the kickdown but the throttle linkage too. I used their stuff and it is good quality and easy to hook up.

Don