Random update: Front wheel has been ruled out after swapping in the front from my Paramount. Same size/brand tire, Continental GP Classic, but on H+Son rim and Campy high-flange hub. Just about as perfect a wheel as I could ask for.
...the shimmy remains.
Might just tear the whole thing down and take the frame/fork for a proper alignment. Was hoping to avoid that.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera