I can almost give you a 100% guarantee that the Mac shown in that link has the new ROMs. I know because I once owned that type of battery-door-SCSI-port upgrade -- you had to use newer ROMs.
Evidence that the stock 64k ROMs are not used on the Levco. Thanks for this.
And so, the search continues for an upgrade board (especially one with SCSI) that allowed continued use of the stock 64k ROMs. Was such a beast even made? Will we ever know? :-/