My 402 LS2 is for sale..
But, on the 5.3L deal.. the problem is that they are so crazy cheap used that even the price new shouldn't be that much. Heck, I bought one complete for $300 once (25k miles).
I suppose $1600 ish would be fair and the "newness" would be worth the extra.
And sure, a complete engine has the drive system and intake, but do you WANT to run those?
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones:
https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS