You'll have to post the whole VIN, WDB123 means nothing in terms of determining its origin. Being pre-81 it very could have no letters in the VIN. They were all made in West Germany regardless of where they got sold.

If you post the whole vin someone can decode it for you, noone can do anything malicious with the VIN, so I wouldn't worry about posting it.

There really isn't anything inherently better about a euro that year.

Have you adjusted the valves?

__________________
68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i