Yep...$10K is a bit high, especially with 110,000 miles (or more on it). Maaaybe $8000...maybe. A $6000 car with $4000 worth of recent work doesn't make it a $10,000 car, ya know? Plus, just because a local dealership did the work doesn't mean that it's of any better quality, except that he may have paid stealership prices for parts & labor. Speaking of parts & labor, it's easy for the labor cost to far outweigh the parts cost. So it's possible that an investment of $12000 over the course of ownership is only related to $6000 of materials. But this is all just speculation and me playing devil's advocate. Oh yeah, also...besides the transmission being rebuilt, everything else is expected at 110K miles, and is nickel & dime stuff in the grand scheme of things (radiator, brakes, mstr cyl, etc). And an L48 engine with 110k miles on it may run well, but not strong.
Finally, as a side question to other members here. The small blocks...they were never painted orange, were they? I always thought GM saved orange for the BB and blue for the SB's...