horsepower question

[GMC400]

I have a 400sb out of a '71 2 door caprice. It's a 4 bolt main with a K@N filter (free) and dual 2" straight pipe. I know it's not much to go by but what would an estimate on horsepower be?

[TyphoonZR]

Probably 225-250 hp and close to 300 ft lbs of torque, just a guess.

[GMC400]

thanks