will these heads work on a foxbody from either of these cars? are they different than what came on a fox 5.0? a friend of mine was at the local bone yard yesterday and said it looked like the heads on those cars are aluminum. are they better than stock? will they bolt up? what about the heads off of the pickup trucks? it's rare to get a v8 explorer, but there are quite a few v8 tbirds, lincolns and pickups.