What system software have you tried to run with that ROM to prove what it is?
I just had someone write me offline about this, and he too told me his ROM was "030-4339" and then he wrote back to say his eyes fooled him and the number is in fact 630-4669. No doubt you made the same mistake. But ROMs with p/n 630-4669 are stock SE/30 ROMs (or IIx or IIcx) according to Apple:
http://support.apple.com/kb/TA39429?viewlocale=en_US
Here are photos, front and back, of my IIsi ROM currently running in my SE/30 and allowing me to boot into System 7.6.1 and OS 8.1:
http://www.flickr.com/search/?w=66071596%40N00&q=IIsi+ROM+SIMM&m=text