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this may seem dumb seeing as i already know the motor is a 440 but i cant seem to find the code any where. im trying to figure out what horsepower 440 i have. it was build 9/25/75 the casting number is 4006650-440-7 code mn. can any body help me with figuring this out or have one that they have...

As i said in the title of the thread i got a 440 modified motor in my 67 charger im looking to get as much horse out of it as i can. That being said if i can i want to twin turbo and supercharge it with out coming out of the hood. Has any one done this before and have a set up they could show me...