Maybe you can help me with my number, Doc.

103 942 10 007 524 3 9 2

The car's build date is 12/87 (chassis no. F449XXX). The window sticker lists the engine number as "007524". So what are the last three digits? (I can't see how they could be a date code for for an engine built in late '87.) They are stamped on the block with spaces between as listed above.

Duke