All the engines on my 50's 60's and 70's Morgan 4/4's were black and were original as far as I knew. I also have recollection of Ford genuine reconditioned engine parts at the time being blue.
Titus
2007 +4 4 seater 2017 Mini Cooper 2007 VW Camper 1996 Honda TRX300 2012 Husqvarna 216