Need some help here with engine ID!

Hi folks!

I am getting ready to list my 72 T/A soon and I am struggling with some engine identification.

Here is what I've got:



Date code:
A252


Casting number:
485428


Front number:
C392013
WM





The block stamp is where I am having issues. I was able to take off some block paint and uncover the stamp; however, it is not in perfect condition. I will attach a picture if I can, but I believe the stamp is this:
1/L 2 N? 3/8/6 8? 0 5 71

What is more confusing is that there is a SH stamp directly below the stamp and I haven't seen this mentioned anywhere. Any insight?


Is there anyway to get some more clarification on this? The numbers do not match the VIN on the car it seems. Our car was built at Butler Performance in 1999 and there is no mention of a new block. Additionally, the date code on the block is very, very close to the build date on the PHS report. It seems likely that this is the factory block, but stamp codes don't match up.

Sorry to intrude, but I really appreciate the knowledge on this sight.