The horsepower depends largely on which small block 305 you have. Most of the early model 305's(1976-1980) are around 150 hp with a compression ratio of 8.5:1. The later model versions hover around 190 hp all the way up to about 215 hp. Check out this site http://en.wikipedia.org/wiki/Chevy_small_block#305
Advertised Horsepower is : 140HP @ 4000 RPMS. stright out of book.
The 3.7 liter V6 in a 2012 Ford Mustang is rated at ( 305 horsepower )
305 horsepower
305 horsepower
either 160 or 165 horse.
305 horsepower
305 horsepower or 325 with Ram Air.
295 to 305 horsepower....
305
305
yes
235 horse is stock on 98 305