If you want to stroke it, then do that.
Be prepared though, that it's not a cheap exercise.
If you stroke it with some decent compression (aim for an honest 10:1) nice size cam, T/P manifold (either dual or single plain, depends what you're after) 1000CFM throttle body and mabye a little tidy up of the heads it should make an honest 400HP.
But that'll set you back about $7000-$10,000. That's just the engine, no other driveline work.