I really appreciate all of the knowledge that you all possess. Lets say for a moment I am searching for a short block instead of a turn key. Is there a difference between the Horse power capacity of a 440 block which came out of a 70-71 cuda or challenger, versus one that came out of a Newport, RV or truck. Also what is the difference between HP versus non HP stamping on the block. Finally, can anyone direct me to a reputable source for a 440 block or complete engine? I live in Florida. thanks for all of your help thus far.