Close to pulling the trigger... any specifics to watch for??

Assuming stuff hasn't been changed in its 55 years on the planet, it will be 9" drums all the way around. I just rebuilt the ones on my 66 Valiant and they are at least credible. And they stop WAY better than the worn out version. Wheels will be 4" pattern. While the 4.5" pattern give you almost unlimited choices in wheels and tires, there are plenty of good ones for SBP. I kept the SBP on the Valiant, but upgraded to 15" wheels for better tire selection. If you get the itch, there are custom options depending on the thickness of your wallet.

I'm doing a complete upgrade/rebuild on the Valiant, and I've not had trouble sourcing parts. Feel free to shoot a PM if you need specifics. Sounds like a cool car BTW!