To help you get the best setup for your classic arcade experience, let me know: What are you planning to run this on? Are you using a keyboard or an arcade stick/controller ?
Please note: The legality of downloading ROMs depends on local laws; it is recommended to own the original arcade hardware/cartridges. If you're interested in setting this up, I can: Neoragex 5.2a Official Fullset All Roms -neo-geo