i have a friend with a 70 linc. he got it cheap and is going to resell it so he dont care what happens to it as long as it runs and is sellable.i have a 72 linc 460(stock) i would like to get the heads off the 70.(if im right these are the good factory ones right?)my friend dont care if i take the heads as long as i replace them and it runs. would it be worth it to do a head swap with my 72, or just pick up some later model heads from the junk yard and do a swap with my friends 70. thanks guys.