Rob....dyno only....with very similar hp and torque curves the only difference you would have seen would have been from the weight difference.....If I had something that I was going to keep I would go with a set from AFR.....if your going to save some money go with the world products (old dart company) iron heads....they have a set with 49cc chambers and intake numbers from 200, 215, and 230....for around 750-800 bucks....