I was debating selling my dedicated mortal kombat 4 revision 3.0 if that matters nice cabinet fully working just rejuvenated the monitor and installed new power supply.
pcb goes for 250-375, since MK4 is not as " wanted " as 1-3 the dedicated cabinets go for 500-600. Best of luck in whatever you choose to do. I'd be interested in the board only if you wanna dump it.