Oops. Good save, thanks DDK
The main place I'm posting info about this restoration is the UK forum, DDK. http://www.ddk-online.com/phpBB2/viewtopic.php?f=28&t=48740
One very kind and knowledgeable DDK-er pointed out a bit of a cock-up. My fault, I did know about this detail, but had forgotten somewhere along the line.
To elaborate, what's wrong with this picture? (my car):
Clues from some relevant reference photos of 70/71 cars. With thanks to Giovanni Favelli and David Conklin.
Yep, the cock-up is...
.... the highlighted drain holes are not correct for a 1970 car. I'm told they were introduced during the '73 model year.
You all knew that, right?