Jedi Knight (???), After much angst and hair pulling, I finally found out what you have elucidated me to... right tag, wrong carbs. The ones that I have appear to belong to a Triumph TR2 - TR 4... this presnts a card whose workings are backward from what is needed (linkage, etc) as well as being too long... by the by, the AUC 866 does have a front and back float chamber that is different. The Healey 6 port (late BN4) mounts the carbs at a 45 degree up angle. Thanks for your interest in my questions. Now I am searching for a used set of REAL AUC 866s. Moss has new ones for $1,600.00 USD. Worst case I will buy those...
Happy LBC'ing, Ron