First let me say: Conrats on your purchase. Sweet car.
As for the plugs you bought, I had to gap the Bosch Supers I plugged into my block 3 weeks ago. One thing that I've learnt (among many other things) is this: check each plug with a gap gauge. I've even had to re-gap a plug insalled by the MB dealershop.
Your owners manual will tell you the proper electrode gap, look in the back. If not, set each for 0.8mm. (thats what my 85-95 workshop manual tells me)
Cheers for now