Not necessary. If your i3 doesn't have HD4000 (i3-3220) then you'd need a few minor changes.
It's a kepler based card so it is, technically compatible. It's still an 8 year old card and not a great choice. It may have graphical glitches with Catalina. An AMD RX 570 or 580 is the better choice for graphics. They are very affordable, especially on the used market. They will perform far better with macOS. An RX 580 with 8GB vram should be all you'll need. It's the most commonly used card in this hackintosh community.
It should work with the right model and the right software to play and burn Blurays. I believe most have used the LG branded Bluray drives in the past. I've never used one. As you may know, Apple never put a Bluray drive in any Mac they sold. Use site search to learn about Bluray compatibility.
Most any major name brand RX 580 with DDR5 Vram will work, even XFX. I've only owned Gigabyte which has fan stop but not used any of the others. Overclocks are no problem. You will probably never draw close to 185 watts of power for a 580, those are the maximum numbers. You could try your older PSU to see if it would work. If it's good quality and over 450W rated it may be good enough. If it's the stock HP 320W PSU I would just upgrade it right away and not use that.
Don't the Rules say you must try a minimum of one week before calling it quits ?
I think I spent more than that reading on how to hackintosh before I even created an installer
