Does my 451 have to small of a cam?

The statement it feels like the brakes are applied worries me. When the case is cracked from a bad sprag it feels like this. I dont know if anyone has told you this but never do your burnouts in first gear and let off or the over running clutches suffer damage.The previous owner may have damaged the trans. Years ago I did this and it felt like hanging brakes. If the wheels are all free I would have the trans checked for safety. Search the exploding torqueflites thread here. lots of good info.