Sorry, missed this originally. I've no experience of this engine in a Morgan, but i used to run Silver top Zetecs in Westfields, with various inlet/cam/exhaust options, all managed by either Weber alpha or Omex 600 ecu and mapped by Northampton motorsport.
1.8L on poor 45's (2 progression drillings only) 4 into 1 long primaries exhaust = 145bhp
Same on unlocked ECU, 155bhp
130 spec motorsport 1.8L zetec with balanced bottom end, light flywheel, port matched head and casting marks removed, ex esprit 45's with 5 progression drillings and as big chokes as we could = 175bhp
Set of piper 285 cams added and timed in on the RR and jenveys fitted = 192bhp and still reliable.