a-arm and ball joint

in the porcess of removing my driver side a arm, i stripped the hole where the ball joint screws in. so i found a replacement one at the local unk yard for only 20 bucks! The problem is that i cant get the ball joint out of the replacement out. Ive really torqued on it and even heated it with a torch and it still wont budge :evil: :evil: :evil:

even tho i am using a pair of chanel locks because the head is too big for any sockets i have, is there anything you guys can suguest?????

its a 1970 340 duster