i went to the juck yard saw a few 351w i in the f-250s and a couple vans,there $100 buck for the short block, is it really worth doin the exchange of the block,i already have the gt40 heads and intake off the explorers, would it be be worth putting that on the 351w, theres one piticular one i found thats pretty good shape the whole truck was nice it was just hit good from behind, let me guys thanx