The 305 "HO" was actually dropped after 1986. In '87, the base 305 TBI was rated at 170 hp, the 305 TPI was rated at 215 hp.
Not enough.
the 1986 Chevy truck 305 HO produced 180 hp
305 hp
Base 305 4bbl (170 hp), optional 305 TPI (215 hp) or 350 TPI (225 hp)
A Stock 305 Pushes Around 230hp/200 foot lbs torque @ 4900RPMs. But, I dynod my 1985 El Camino 305 HO with an Eldelbrok performer intake, dished pistons, with 58cc heads and 9:1 pistons at around 302hp. Must be wrong. I have just researched the engine in my '55 Chevy Pickup and find it is a 1984 305 LG4 which is rated at 150 hp. The 305 HO is rated at 190 hp. You did not say what YEAR 305 you started with. FYI - buyer beware - it was sold on EBay as having a 350 cu in in it.
Around 150
1989 was 160 hp 1998.5 was 215 hp 2003 was 305 hp
305 hp
305 hp
305 hp
305 rwhp