however while trawling google i found this:
http://www.elecauto.com/vol940.htm
OPEL VECTRA 1.6L 16V NL16202319 CHK:1021 DELCO PLCC3229F010 NL16202319 BSSC
OPEL VECTRA 1.6L 16V NL16202319 CHK:12E9 DELCO 27C010 NL16202319 BUFH VE16BUFH.ORI 932
OPEL VECTRA 1.6L 16V NL16202319 CHK:999B DELCO 27C010 NL16202319 BUFH OPELV~15.STD 3203
PLCC3229F010 = PLCC 1Mb flash
27c010 = DIP32 eprom
andoro2me, you mention that you ecm has the 40 pin holes for a memcal header?
so perhaps the flash can simply be removed and a memcal header be installed.