Ford initiated all kinds of performance unfriendly engine mods in the 70's to comply with federal emissions requirements - lower compression, softer cam profiles, open-chamber heads, ignition timing altering vacuum gizmos, etc. Luckily, most Panteras don't have stock engines anymore - mine included. I do have a number matching 351-C block, but it's been reloaded with 10:1 forged pistons, a medium agressive cam, a dual-plane aluminum intake sitting under a 750 dp Holley, and tube headers with stock looking but gutted mufflers. In the current configuration, it's somewhere around 400 hp, which for a 3000 lb car makes it very quick - not hair-on-fire acceleration but it does shove you into the seat. It sounds pretty mean as well.
I'll post a few photos after I get home from work.
1998 PC800 (Wife's)
1972 Detomaso Pantera GTS
1994 Mazda Miata R Track Rat
2005 Acura NSX