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Besides the 440 what are the other numbers for? And does HP mean High Performance?

the measurement is 3.985, that is with calipers The stock they say is 3.5 for 360 stock bore. Thanks for any help Ps I was going to do a 440 in a 70 Duster, the Duster came with the 360 I'm currently taking apart the motor, I have 700.00 into he 440 block And thats with just cleaned up 3...