I know this is kinda aimed directly at John, but maybe I can help a little...
Welcome to namco custom leg rot syndrome, the J349X is a custom security chip and can be a beast to find because there are no drop in replacements. Your best bet is finding another namco board with the chip to take parts from or asking on KLOV (if you are a member there) unless you can repair the chip legs by soldering on new ones, this can be done sometimes depending on how the legs have broken.
For the other chip it happens to be a bi-polar prom this one can be replaced much easier than the other one, you just need someone to burn you a new one I have heard good things about
http://www.hobbyroms.com/ and they can do that one easy.
As for a eprom burner, I personally use a GQ-4X that you can get on ebay for about 100$, but it doesn't do certain chips, I know it won't do PAL/GAL chips or BI-Polar proms so If you intend to do lots of chips like those it won't be the programmer that you need.
However, it is a good basic programmer and has done great for me on other chips though (for example: program roms, freeplay kits, bios chips), on the very rare occasion I need one of the chips my programmer doesn't support, I just order them pre programmed from people who can do them.
