Not sure if anyone will be able to help/shine some light, ive been trying for a while to track down someone with knowlage regarding grey motors.
Problem,
Need to rebuild the ::)*vauxhall* ::) version of the grey motor, but i need to find out if i can use aussie grey motor parts (need to put some aussie in it ;). ie manifolds, head, cam, fuel pump etc. any help / direction would be great :)
You could get in touch with an enine rebiulder such as Duncan and Foster they have been around for a long time and would probably have struck this before.
Where are you located? as there is probably someone close that would have a set of manifolds you could compare.
Hope this helps
Frank
Try the Vauxhall Owners Club
http://www.geocities.com/voxlowner/voxlhmpgVIC.htm
Red