The guy is unsure of the year. The block had 603mx22 on the side stamped on it. Is there a website I can go to to identify? Thanks

Okay, I think I found my answer. 96 motor made on March 22nd? Can someone confirm that based on the block number? Thanks

check your chilton book it explains how to read the block.
Your block build date is 1996 March that should be all you need to know.