A new one is now 2800.00
https://www.ebay.com/itm/NEW-OEM-GM-...AAAOSwbaxckkQP
Otherwise you can get the 350 ZZ short block and put your choice of heads on it and cam
https://www.jegs.com/p/Chevrolet-Per...49884/10002/-1
Might be cheaper to buy a "core" off craigslist and use that for a reman motor.
Rebuild yours if you have the time
When I get to do mine, I will get a new block (1pc seal) and rebuild the engine to what I want