Hey Mate,
Its good you want to learn. I relly suggest you read, read, read... and you will get there slowly.
Volunteer to come help some people when they are working on their cars and they will be happy to let you hang around... just dont break anything
You have a single carby. Its under the round thing in the middle (air box/filter)
On the engine there are numbers. Find them and post them here and people will tell you what engine it is.
Oh, and as a wise 'Doctor' once told me, better get thee a manual...
Peter.
PS: I have a '76 Clubbie too

Dont let the wossy round nose guys push you around.