I think that the 8 valve and 16 valve cars are different, as I know for sure that there are 2 different masters and 2 different connecting pipes.
If you have the 8 valve it looks easier than my 16 valve as on the 16 valve the master cylinder is bolted straight to the bulkhead where as the 8 valve looks to be bolted to a seperate support.
As I have a 16 valve this is what I did:-
1. I had to remove the inlet manifold at the rubber connectors to get at the connection to the slave cylinder and clamp the supply hose.
2. Next push the seat all the way back
3. Disconnect pedal from Master cylinder (spring pin and washer) so you can move the pedal out of the way.
4. Undo the supply hose clamp.
5. Using a 3/8" drive socket set with a long wobble extension Undo the 2 nuts securing the master cylinder to the body.
6. Pull master cylinder out after freeing it from the supply hose.
This all seams straight forward until you see the amount of space you have to work in.
I think thats about it but it's been about a year since I did mine and I might have forgotten something.
p.s. the inlet is held on to the support bracket by 2 15mm bolts, which you get at from below.