scratching my head over engine numbers

[ezz16]

hello I bought a 1955 1st series just over a month ago.it had been rodded in the early 90s. was told the donor car was a 79 monte carlo. front frame clip motor/trans and rear end. it runs drives around the block after a 20 year nap. but I'm trying to figure what engine it has. my son (much younger eyes) read me the numbers I wrote them down but couldn't match anything.
tonight I pulled the alternator back to get a good view and still makes no sense the stampings are on 2 lines as follows
v1210cpy
17n525736

I can't find anything even close .it's a chevy? v8 and 3 speed auto 2bl carb
anybody have a clue thanks Barry