Well tom c you're smack dab in the middle of a transition time at Chevrolet. '53/'54 is the beginning of the transition away from forged steel to cast iron camshafts (evidenced by the width of the dizzy drive gear). That and the cam journal size will identify the bump stick. The part number (not a casting number) you reference is for a cast iron large journal cam. Here's a link to the parts wiki at the Heritage site:
Chevrolet Parts & Accessories Catalog P&A 30 March 1957
