vortec hrads are very good i run them n love them, bu they need alot of work to accomodate a good sized cam
with no work they can only handle a 460 lift or so, if u mill the spring pockets and cut the valve guides u can get away with about 490 anything bigger requires new springs retainters and keepers,
when its all said and done its acually a lil more expensive than most people think, all in all ive put about 500 or 600...i bought a set of stock vortecs and had all the work done
they run well though makin almost 450 horse on a mild 383 with a roller cam
they r a good head,but its a kind of complicated route but its ur motor ur choice
as far as the other heads go its preety much a toss up they r basically the same