Hi Dave
I have more info for your Thread have been crawling around with a bore scope.
engine number 900054
engine cast date 6/65 same as on transmission
paring number 259
drivers side casting 901.101.101.01
passenger side casting 901.101.102.01
Interesting fan housing number I can find no comparison on the net 901.106.102.6
I also read on old post of yours on Pelican that there was another pre-production engine 900036? do you know what car that was in?
Thanks Bret