I finally managed to get the waterblock for my old 3090

I was looking for months until I finally found them in the fb marketplace for total 110$CAD. I actually bought them from two different people.

The waterblock is from someone saying it's his friend's cancelled build so it's never used. It does look new and clean, but he didn't have the original box, pads, even any screw making it feels sketchy.

The active backplate is from someone's build that was still running. The downside is it's not transparent acrylic so I can't see the inside but I can confirm it's not leaking.

Before I start tearing down the 3090 and order tubes and fittings, what do you guys think? I've already bought new pads and additional screws and I'm waiting for the leak tester to arrive. How bad this can get?

Also will one 360 rad 30mm enough for it if paired with 5800x3d? Or should I get two 360 20mm? I'm not going to overclock it anyway, just a fun learning project.