H.O. is just an abbreviation for high output. It really means nothing. As far as building an engine, make sure you build one with the mass air set-up. Since your stang is an 84 you don't have mass air. I'd try to get a complete engine used with mass air and computer. That's why everyone is running so fast while attaining a good street car. The mass air and EECIV computer makes it possible. Speed density is o.k. with little bolt ons, but change the airflow like a small cam or such, the computer can't tell there's more airflow and the computer's tables are mixed up and the car is going to run crappy. Also your 84 engine does not have a roller cam. That is a big disadvantage. Try to rebuild an engine from 90-93. Make sure you research everything before you start buying. Good Luck!
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