i think those numbers or the ford part number though.....

on ALL FACTORY cossies, the last 5 number of the VIN are the engine number from cosworth, so for example, my vin plate is WFOBXX.........NL95154.

the NL denoted the car build year and month and the numbers are the engine number from cosworth.

just dont know where its stamped o nthe bactual block though?