Thanks mate, took a lot of time to get it to the stage it is at.
The engine was built over 3 years ago by a guy named Benny and since then a friend and I have been working on it.
Back then he listed it as a N1 Pump (I've got a feeling it really is a Tomei Oil Pump, but don't want to give any false information as the list of parts used I received had the N1 listed). Don't know why it was used back then, guess it was his preffered choice, I know it's not the best of choices.