A lot of this information on restoring vintage Porsche calipers probably applies to Volvo ones: https://pmbperformance.com/pages/the-ultimate-brake-caliper-restoration-guide This shop has them zinc plated, as Porsche did from the factory. It should be noted that zinc electroplating is different from...

There still seem to be a lot of these calipers in the supply chain, parts Geek reports 20-50 count rebuilds in stock for rear caliper under $50 with core.

I’ve sent back two unrebuildable cores so I was getting worried about this , too, but it looks like we have time still.

We're amazed by how well this car drives, it now makes a sort of motor sound from the driver's side wheel and it goes away when steering one way, gets louder the other way. Probably a wheel bearing, I didn't feel any play when put up for tire rotation. Classic front wheel bearing Wrrrrr wrrrr wrrrr...

Don’t forget the bear River converters. If you have enough pipe left to connect, you can band clamp a connection in 304 SS and get good 5 year life without welding

Where is the hole exactly Pete?

I’ve got two spare exhaust manifolds for NA cars upstate I’ll look for. Both came off 1998s

Pete , band clamps are a magical 5 year repair on exhaust which also spare you from having to eat canned soup. They are about $15-20 on Amazon in 304 Ss