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Why do you want 600 HP? The reason I ask this question is because people often think that is the HP rating of some fast car they know that often times isn't all that fast maybe runs 12's or even 11's in the quater. In all reality the car may only be making 450 HP. The reason the other reply you recieved wasn't very receptive to your idea was that many engines out their do not make that much HP. It takes an extremely wild 428 to make that much power but it can be done and anything can be driven on the street for example I have a tubbed 80 Mustang with a 427TP duel 800 holly carbs 14:1 pistons and a 719 lift cam with a 583 rear end gear and I have driven this car on the street in my crazier days but it is not what you would call a street car although I have driven it to work. The big question is is how fast do you want to go and how streetable do you want the car to be? Stock eliminator 428 Mustangs dyno at 500HP and run 10's in the quarter and this type of an engine could be made streetable and retain the power without the restriction of class rules. If I can help you with your problem please let me know with a response.