Using 65 Newport BBP set up on my Dart?

Troub said

Less expensive than getting new ones Professor? What kinda shop would handle?

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Cost of new ones have come down considerably over the years, so it's not done a lot anymore- but considering current supply chain issues and parts never being in stock anymore, it is still a viable option. Maybe not for a track car, but they do very well in a street-street/strip car as long as they're still in good shape.
Just about any decent machine shop should be able to handle it, I've had several done locally in the past. I even had a special broach made for this (cutting new splines), but most shops aren't going to have a broach machine anymore. They can be cut on a mill easy enough.
Moser (as well as others) also offer a cut/respline service.