The "tweaked twelve hundred" described below was built from a pile of parts that were laying around the workshop, including the new 77mm pistons that had been bought in for someone who never came back.
Even the 1200 GX exhaust manifold was found in the parts pile.

The cam was also left over from one of the race engines & is of an unknown grind, but it has a damn lumpy idle & kicks in a fair bit into the rev range. The car was dyno'ed at 80hp at the rear wheels, so i guess that's not too shabby for an engine built from workshop clutter.