1972 dart 318 want to make the tires spin

If you have done a cam change, and nothing else it will feel like a dog. I did a cam swap on my otherwise stock teen and it was a dog from a start. I swapped to 3.55's and that helped immensely, I can spin the tires at will. I need to rebuild a core trans I just picked up and put a high stall converter in and that should wake it up.