What motor is this?

[AFSP1211]

I've heard that it's not too hard. Just a little more $ than a normal cam swap. This is just what I've heard. I have no first hand knowledge.

Also, what year did they make DBC TB's with DOD? That is new to me. I thought all the DOD motors came with DBW TB's.

Also, with that hole in the center of the oil pan, I'd put my money on it being from an Envoy Denali. Unless the SSR's were AWD, I think that "hole" is for the front shaft on the Envoy's and Trailblazers. Any thoughts on this theory?