Engine Identification

[dkb1970]

Here's my 70' C-10 that used to belong to my dad. It was his farm truck for almost 20 years. He was told when he bought it that the original 350 was replaced with a 327 from a Camaro (around 68' or 69'). I'm trying to figure out just what block I have but can't make out any numbers on the block. I'm thinking about moving the A/C brackets so I can access the area to lightly sand. Hopefully I can make out the numbers that way. Any suggestions would be appreciated because I'd really like to know what I have here. Even if it is a 327, it appears they reused the intake from the 350?