I was referring to the 4.6 in the Mark VIII, the rear seals are not common on these. I know nuttn' about the 302, 5.0, 4.8, etc, etc...
Rebuilds are fun. Cost can very A LOT. There is always the option to go with a newer engine too. I picked mine up for about $1800 I think, it was not too much and is an 03/04, a better engine all around. You would have to get a Mach 1, Marauder or Cobra intake though. There are a few other little things too, but I did it and am extremely happy. I figured since I has to swap engines, I may as well go for the best versus swapping something stock back in. Well, whatever you do, good luck and let us know about it!!!!