Hi Rob. the B is Black, outside, inside and top. Was a pic of on an earlier post.
When I got it everything under the hood was black, and I mean everything, wiring, fluid reservoirs, hoses clamps, carb,manifold engine. Whoever did the earlier paintjob just sprayed it all. When I got the engine block and head back from deep cleaning, I found lots traces of what looked like Leyland light blue paint, I have checked the eng# and casting dates they all indicate the original engine. I doubt that I would have painted it black anyway for the same reasons Kenny gave.
Cheers Ric