360 stroker how much HP is picked up if everything else stays the same?

I look at it like this. 510 HP from 360 CI yields 1.417 HP per CI. So if you increase the CI by 50, 50 x 1.417 = 71 more HP if the HP per CI stayed about the same. It probably won't, though. I would guess you'd pick up about 50-55 if everything else stayed the same.