I hope all goes well with the Cummins project...plenty of diesel 404 conversions out there , but I have seen 4 and 6 BTs in Landrovers and Jeep Wranglers but not yet in a 404, people always say the 404 has the same problem as the Pinz (I have one with an OM602 conversion) the engine bay is narrow and you have a job fitting the engine in with the turbo always being in the wrong place, so it means major surgery to the 'dog box'.