siezed 440

bought a 440 couple months back, been soaking the hell out of it..... wont turn at all, pistons are stuck in there, tried hammering them out that didnt work either..... the guy i bought it from said it came out of a 71 challenger that his friend wrapped around the tree in 75, im running out of options, and i can;t seem to find any good engine shops on Long Island, if anyone knows of any engine places, please let me know..... thanks