This particular romset is definitely undumped and not in mame yet. EPR-6839.ic63, EPR-6838.ic51 are an older version of 68000 #2's code than anything in mame so far; EPR-6848A.ic6, EPR-6849A.ic8, EPR-6850A.ic20, EPR-6851A.ic22 are an older version of 68000 #1's code than anything in mame so far either. (and given the A markings they're not even the oldest version code! There is at least one MORE set, older than the board you have, which we are also missing!)
While I suspect only those 6 roms are 'undumped' (and everything else probably matches one of the hang on sets in mame), I would consider dumping everything from that boardset, and note the icxxx locations each chip comes from. At the very least dump just those 6 roms.
This is most likely an older set than any of the hang on dumps in mame so far.
LN
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"