Cam and distributor gear compatibility

Those cams use the stock gear. The retro is a replacement for the stock camshaft. They aren't cut on a billet core. Magnums use the same pump drive as the LA's

If you have a catalog handy, the retros do not have the distributor gear upgrade required footnote. The drag race solid rollers do. Might be a hint that you don't need a special gear.

I've done a couple of engines with these cams, none took a bronze gear. Unless they changed the material which I doubt.