If its a 4-barrel carb, its 310hp. If it has the W-31 option it was 325hp. Both were considered "high compression" engines. There was a 2 barrel carb 350 cu in that had only 250 hp. Hope this helps.
that all depends on the exact car the 350 came stock in, along with the year. you will find answers ranging from 160 hp (low hp trucks and economy crusers) to new 600 hp stock corvettes all built...