Thank you very much for your reply! I ended up finding a grommet just above the clutch pedal and ended up using that. I got my amp and subwoofer working yesterday and I'm very happy with it.There should be a big rubber grommet on the LH side of the engine bay where the main loom runs through, you can normally poke a hole in this and feed the wire through. Then its an easy run down either the sill or under the console.
View attachment 323677
View attachment 323678
**based on a RH drive 323, yours might be slightly different or on the other side.