I'll give a bit of a background on the car. My dad bought the car about 16 years ago pretty much the way it is. It was built to handle big power and the previous owner had planned to put a stout stroker in it. That never happened and he sold the car with the 383.I believe it was put together with spare parts that he had. For a variety of reasons my dad didn't get around to building another engine. I have the car now and have a 400 block to work with. I swapped out the cam because it had a rounded off lobe. Thought the new cam would help the lowend which it did but didn't expect the topend to drop off so much. Eventually the car will run as fast as it looks. Right now its all show and no go.