I wanted to add some horse power to my 350, 290hp, Chevy crate motor. I read an article in Chevy Performance Magazine about them experimented with different add-ons to see which ones gave them the most performance gain for the least amount of money. After reading that article and getting some other professional opinions , I decided to replace my stock 350 heads with a set of Vortec heads, and the intake manifold with an Edelbrock Air Gap manifold, I also replaced the stamped rocker arms with a set of roller rockers. I kept my Holly 670 carb. After the upgrade, the engine ran great and you could tell it was producing a lot more power. I took my car to have it dyno tested at a local race engine and chassis builders shop. The owner is well respected and very competent at what he does. After having it dynoed I was very surprised when the dyno showed that it was only producing 195hp to the rear wheels. I started out with a 290hp motor, after the upgrades it was obvious that it was producing considerably more power, but it was only putting 195hp to the rear wheels. The motor wasn't out of tune, the timing was right, the air fuel mixture was right, 195hp was just the best that it could do. Any comments or opinions from anyone who's had a similar experience would be appreciated.