Just for laughs 150.00$ 1967 383

On an engine like that it is easier to just bust the pistons than to try and get them loose. You can reach up under the piston crown with a steel rod and then pop it hard with a 5 lb hammer and the crown of the piston will break off. Once you break a few of the pistons off then you can rotate the engine and pop the rest out. That block is probably ruined but you won't know until you get it de-rusted and run a boring bar thru it.