Or... if you haven't bolted the Dart heads on yet, you can put those back in the box and exchange them for the 200cc iron eagles or even the 180's might be even better for the street. The 200's would be good if you wanted to stroke it to a 383 later on down the road. As for horsepower, I figure you'll be right around 450hp with around 10-1 compression. You'll make more torque and a broader powerband with the smaller heads.