HI John
The engine I have hear looks like the one you have, with the heads modified to fit the cylinders and the cases bored also, the heads are STD "L" engine spec', the engine is being re-built and waiting for some fresh cylinders at the moment, it is up to this stage;
with one of Supertec twin plug dist.
The pistons have been changed for some JE ones, from Supertec.
regards mike