If its a cam chain does that mean we are talking about a good old fashion push rod engine?
Not as such. It's a DOHC quad-cam with VVT.
As mentioned, for the '99 model year the V8 changed to 3 valves per cyl.; slightly lower emissions and slightly better MPG.
There's a graph somewhere here showing the BHP/torque curves of both engine versions. IIRC bhp is lower on the later engine, but it has a flatter torque curve.
Edit: here you go http://www.mbclub.co.uk/forums/showpost.php?p=665286&postcount=13
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