hey, as you all know i have a 1991 305 5.0 was is the factory hourse power rating on this car im sure its not good, i think it is some where in the 180 range.

Check this out:

http://www.9c1.com/brochures/1991/91_9c1.pdf

It is the official police literature from Chevrolet for all the '91 Caprice police package models.