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I got a x head today the casting number is 2531894-3. From what I could find these heads were made from 68-70. Does anyone know what the -3 stands for

I have a 69 340 block and a set of 1975 360 heads. I want to cut the heads to lower the cc. Does anyone know how much to cut of the intake, if I deck them 50 or a 100ths