HotRod Mag 408 build w/TrickFlow heads NEW

Go to Simpsons Speed Shop on youtube he has a video of a 360 build with the trick flow heads stock bottom end, rods and pistons makes 530 hp! I tried to post link but whole video showed up in post so thought I better remove it.
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Which leads to the question why would you need a stroker when you can pull the same horsepower out of a stock bottom end 360