Thats OK razor.
When i started as an apprentice motor mechanic many many years ago, the FIRST thing they taught us was where the workshop's library was & how to find the manual for the vehicle that we were working on.

Have a look on ebay. They often have manuals for the model that you type into the search engine & they are often quite cheap. Even at $20, they will save you many times that the first few times that you use it.
It's the mechanic on the bookshelf & these Gregories ones are written in a basic, easy to understand way & are geared for do - it - yourselfers.

Sadly, some of the "experts" are not too savvy, even if they think they are. For example, someone might tell you to get a used pump from an A12, but forgrt to mention that there are two diferent A12's. Just check the position of the distributor. The early one from the 1200 model [B110] has the distributor right at the front, while everything else has it further back.
Both types use the A12 engine number prefix.

I know i can be a sarcastic bastard, but after all these years i get a bit tired of reminding people that the manual has most of the answers, most of the time.
Its something that some of the experts could remind themselves.
Chris
P.S. 1200rallycar.
Call me any name you like, but you KNOW i'm right