[wilf leek]

Once again guys, thanks for all the help. As soon as my new header gaskets arrive the torque wrench will be out.

TomS - I checked with my engine builder - the alternator bracket is his own design/make. Basically a thick plate spanning two bolt holes on the front of the heads, with a cylindrical stub coming off it, female tapped for the bottom bolt of the alternator fixing. Picture below should show what I mean.
Gosh - isn't my engine getting dirty down there!!! And rusty in places too.