RE: SHoshop kit is NOT a good idea as Jason (PA3.0svt) can attest to. Find a good 99'+ 3.0 short block. Use your heads, cams, manifolds. If you want, and based on what you do and the tools at your disposal, I would do some headwork and maybe add the larger 3.0 valves. This will yield a compression a bit more than 11:1 You can always open up the combustion chamber on the heads to lower that if you want. Using your heads eliminates the water pump hassle on with the 99 heads and the intake port hassle on the 00'+ heads. The only downside is the higher compression.
You also need to grind the crank down just a bit to clear the clutch/flywheel assembly. You MIGHT also have to drill and tap a hole for your knock sensor. It seems some of the 3.0's have the same one we do, some use a different one.
Lots of info here in the archives and at
Warmonger\'s 3.0 FAQ and DavidZ's Homepage/3.0 FAQ which does not seem to be working right now...
Good luck with the project! I'm sure yours will turn out great.