You put a longblock in...

OK...from where did you buy this?

You compared $2000 in machining and parts and (still wouldn't be complete) versus your solution...a $1700 GM crate engine.

YOU CAN NOT BUY A GM (I said GM) crate engine, turnkey for $2000.

I worked at a machine shop for 10 years...I only built Pontiac engines as they came in.

Your assertion in grossly skewed on both aspects...the cost for building a Pontiac block (sans hard parts) versus a "GM crate engine"

I also have an uncle who works at the Willow Run GM warehouse and have kept up on the GM crate engine prices.

Point?

For $3500 plus/minus $500 you can source and build a complete 350 block with heads, machining, parts...etc.

Now we come to this mystical "GM" crate engine. Is it a GM crate engine warrantied and built by GM or is it a reconditioned longblock, sans $1500-2000 in additional parts and costs?

Just because it is a GM block with GM heads does NOT make it a GM crate engine. As defined, a GM crate engine in not a reman, is not a second, and for the most part, it's apples to apples.