thought i'd throw something out there. a guy in brisbane sells conversion kits for a bmw twin cam head on the 1275 mini enginge. i also heard that the mini and datsun block was very similar or the same. i was talking to a guy who played with mini's when he was younger and had an a12 head on a 1275 mini block. so it sounds possible. the guys shop is called reed speed and does mostly mini stuff but if any one wanted to chase it up i'm sure he would sell someone a kit if the blocks were the same.