I have a Montreal
Join Date: Dec 2008
Location: United Kingdom
The book (which I now have) does have on the front cover a picture of the 12v V6 engine and also it says 'Covers GTV6, 75 & 164 2.5 and 3.0 litre engines'.
However... you are correct in saying that the title of 'Alfa Romeo V6 Engine High performance manual', doesn't help if you if you cannot see a picture of the front cover, or a synopsis of what is within.
I found the book helpful, albeit a bit OTT for my amateur mechicanical skills!!!