I got the 27C322, MX29L3211 and MX26L6420 off ebay. The MX26L6420 are quite pricey there, so I also ordered a couple on aliexpress and those were ok too. They just take forever to get here from China with the default shipping options.
For the voltage regulator I would pick the ones that come pre-assembled on a little PCB with input and output terminals. I don't think you will draw high current from them.
On the PROG board I usually use the VR that is already there and feed the single SMD EPROM from it. Then I install the separate VR on the GFSAMPLE board. There are some images of my install a couple of posts back in this thread. This eliminates the wire from the PROG board to the GFSAMPLE board and makes it a lot easier to test the gaming when you are working on it.
As a first step I would also just replace the 27C322 on the PROG board and do the PAL rewiring to see if the game boots. Once that looks good, you can replace the SMD EPROM on the PROG board and do the work on the GFSAMPLE PCB.
Do you already have an EPROM programmer that will write the MX26L6420?
For the voltage regulator I would pick the ones that come pre-assembled on a little PCB with input and output terminals. I don't think you will draw high current from them.
On the PROG board I usually use the VR that is already there and feed the single SMD EPROM from it. Then I install the separate VR on the GFSAMPLE board. There are some images of my install a couple of posts back in this thread. This eliminates the wire from the PROG board to the GFSAMPLE board and makes it a lot easier to test the gaming when you are working on it.
As a first step I would also just replace the 27C322 on the PROG board and do the PAL rewiring to see if the game boots. Once that looks good, you can replace the SMD EPROM on the PROG board and do the work on the GFSAMPLE PCB.
Do you already have an EPROM programmer that will write the MX26L6420?