its na m40, easily tood by the fact its only got a single cam (look at the size of the timing case)
steer clear of this engine, very unreliable one over here in the UK!
i dunno dan, my old man had an M plate e36 many moons ago which i think had the m40 (94 car - never really cared what engine it had i must admit) and it had done nearly 200k miles by the end, never gave any grief, never used any oil, was quiet and good on fuel etc. whats your reasoning for them being very unreliable dude!?
as for the engine, def a bog standard run-of-the-mill m40, with a bog standard inlet manifold without DISA, only fitted to m40s not m43s, and a bog standard plastic timing belt cover found on all of them.