Received this from a friend today which may help you out a bit. I couldn't proffer any help myself as both my Plus 8's were nothing like this arrangement and no information is better than duff information in my book.

Thanks to Lorne for going the extra mile on this one thumbs.

8 alternator bolt is accessed through a slot Morgan made through the adjacent valence. Other wise, one has to laboriously remove the bracket the alternator is attached to..which has three bolts, two visible from
the top and another hidden at the bottom. That is not only fiddly, but dangerous as it leaves one very awkwardly. holding the heavy alternator and this huge bracket, both removing it and reinstalling it.

http://www.gomog.com/allmorgan/GMalternator.html#WATCHPOINT

[Linked Image]

2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev