For instance, Diamond has several pistons for a 4.25" bore and a 4.25" stroke which would give you your 482ci. You could go with a 6cc valve relief piston, along with a 76cc chamber. If you put the pistons at zero deck height, you would end up with an 11.8:1 compression ratio. If you milled the heads and took 2cc from them, you would get your 12:1 SCR. Putting the piston at zero deck will give you excellent quench.
There are several options there, but for anything but a pop-up dome piston, I would imagine you'd want the 76cc cylinder head. I would rather have a flat top as many think the flame travel across the piston is much better.
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