During my '76 Sporty rebuild, I've managed to aquire a spare engine, to build up one engine out of bits from both of them. Given the original engine was pretty good to start with (the problem was with the gearbox, not the engine), I'll soon have for sale a complete bottom end - crakshaft, flywheel, rods (assembled, spins very smoothly) - barrels and pistons and a pair of heads and rocker covers. They'll probably go on EBay, but if anyone's interested flick me a reply.

Should chuck this in the For sale section mate, bound to be some interest

Thanks Burnzi, didn;t even know there was a 'for sale' area. Once the motor is done and I know exactly what's what I'll be doing this. Good on you.