all you will need:
PI heads fully assembled w/cams (prefer Romeo, since all the parts just swap over)
FRPP Headswap kit (about $105-$115 from summit, jegs, LMR, etc). - this includes new bolts, exhaust gaskets, head gaskets, and dipstick tube
you dont need new chains or tensioners, but a lot of people recommend to change them. i had 130k miles when i did the swap, still using the stock chains/tensioners, have about 196k miles now.
get new chain guides (about $20 a piece froma autozone, about $10 bucks more from ford)
timing cover gaskets (all three) and the timing cover seal
valve cover gaskets (tho they are usually re-usable, the grommets are usually worn out and you need to buy the gaskets that come with the gommets to get them. have them look it up for a 96/97 crown victoria...for some reason the ones for our cars are the wrong ones wherever you look -- at least wherever i looked)
and thats about it i think. some RTV sealant, PI manifold, PI heater return tube (in the cylinder valley, below the intake manifold), and if possible get some shorty headers since now is the perfect time to do them to make them worth the while (when it comes to labor). you can get some used ones for cheap, i picked up my FRPP shorties used for $100shipped