I'm probably wrong but I thought I remembered you once saying you'd love an L322?
No, I said I'd love the 300 bhp from the 4.4 litre BMW engine in the early L322. But I wouldn't want the ugly bodywork, the complication of the Canbus linked electronics or the cost of spare parts. Putting the L322 engine with the Bosch Motronic into a late model, Bosch equipped, P38 should make most of the electronics compatible (would the L322 engine run on the original P38 ECU even?) and that engine can be converted to LPG without having to mess around with a valve saver.