Any CVH flywheel will fit - however if you are running any sort of EFI system, the chances are you wil NEED the EFI flywheel.

You could machine it yourself, but it is a real hard, slow job. Ligtening and balancing is a pro job only though. Any machineshop should be able to bore the holes out, but lightening and balancing I'd only entrust to a specialist with years of experience and a good rep.