340Cuda- I just figured there is some power to gain with a custom cam over a shelf cam. Most of the shelf cams are designed for the new Challengers, Chargers, etc. (Heavy cars with not a lot gear or converter). I plan to put the 5.7 in my 73 Challenger with 4800 stall, 4.10 gear, single plane intake (Ritter or Cascar), big headers.