Speedy, what engine is the with black manifold runners? Looks like a 12 valve head with 24 valve intake manifold. That's a heck of a mess just to have EGR. And where's the valve cover breather line? Maybe it's under the crossover pipe feeding directly into the plenum. Also no idler pulley above the vacuum pump. Only used with AC? No center nut on the oil filter cover so it isn't out of a 124 or 140. On closer look there are only 2 runners ahead of the crossover pipe. Maybe is a 601 or 602 or 2.9 liter 602 variant.

Sixto
93 300SD