Depending on the engine you have, it varies greatly... 305 was 165-175hp, 327 (if you are lucky enough to have a rebuild) came stock with 235hp, 350 was 165-225hp stock depending on the model the original owner chose... I think those numbers are accurate... if not, feel free to smack me with a crossover steering arm....
Woops... just realized I'm in the diesel forum... forget my post... 130hp seems about right... put 150 psi turbo on it, and you'll be running somewhere close to 500hp or so...