its not the original motor. it had a 351w in it before. Guy that i got it from had said that it was changed to a 460. Is there any other ways to check if it is a 460?
Since 429 and 460 are identical, the crank and pistons are engine specific. There should be alphanumeric markings stamped on the edge of one of crank counterweights. (3rd one from snout).