If you want Dart heads, call their tech line and get some advice. Keep in mind that horsepower primarily resides in the heads because flow is everything. IMO, you ware making a mistake trying to skimp on heads. You should be running the best flowing heads you can find for this engine if you want it to perform effectively. Building a great engine means choosing a combination of parts that work together as a unit. The most common mistakes novice builders make are choosing cams that are too big, carbs that are too big, and heads that don't flow enough air or heads that flow too much air. Then they wonder why their new engine runs like a dog. Just make sure you do your home work and make a lot of calls to get the opinions of experts. You are pouring a lot of money into this engine so you don't want to screw up. Just my two cents worth . . .