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BTW it's going to be a Magnum 360. My dad's car is over 425hp (360 Magnum) and it's not stroked.

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The crate Mag 380hp 360 makes good power and all they change are the cam, springs, and intake. A production 360 with the same or similar cam/springs/intake, milled and slightly ported heads and you are probably at the 425hp mark that you are trying to do.

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This is exactly what you need to do. For that amount of hp get the KB pistons #107 or the forged counterpart but hyper would be fine and budget oriented. Do some basic clean up of the ports, open the bowls, and pushrod pinch a little, get the valves back cut, and smooth the ports out a little. Un ported those heads can easyly make a 400 hp street 318 so get a little mo flow and cubes and 425 is not hard at all and don't really need to turn much over 6000, mabey 6500 tops.