Hey Jim:

Welcome to CHR. My information shows your 3863151 to be as follows:

Hydraulic Flat Tappet
Duration at .050 is: 221/221
Lift: 447"/.447"
Compression Ratio(as originally installed): 11.0:1
Lobe Seperation:114
Used in: 327/350HP L-79

So it would appear to be a NOS L-79 cam. The numbers on the front don't line up with anything (at least not that I've found). The key numbers are located in the center of the cam between the lobes.

Regards,
Glenn