Hi, after finally getting my heads removed my water leak was quite easy to diagnose the near side cylinder head face is badly corroded and was allowing water in to the cylinders!! luckily no damage has occured to the bores and the head isnt worped.
So i decided to do some mild port work and smooth things out, easier said than done! but armed with an electric drill and a few various carbide burrs, and various grit emery and scothbrite, its turned out pretty good.
But let me warn you it is time consuming!!.

after cleaning every thing i have decided to get new valve guides and get a three angle valve job done, plus a clean up skim on the face.
This will not be cheap

but should complement the work ive carried out and hopefully in return i may get a few more horses