You might want to check out Harbor Freight or borrow an engine lift from someone.
Harbor Freight Tools
Sometimes local auto part stores have them for rent.
The 3400 has a Cast Iron block. It's heavy and bulky (300+lbs). So It'll be next to impossible to get out by hand (over the radiator).
Maybe you could drop it on to a dolly then lift/push the chassie away?
What are your plans for the engine? Going to put it in another Grand Am or some sort of Project?