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

Planning next engine. current engine is 360 12:1 (actual), STX-21 cam, W-2 heads with pocket porting, Holley W2 intake, 4:56 gears. car weighs 3100 w/ driver. this motors dyno'd at 510HP
maybe a little more now with better carb. current best is 10.64 at 125.
So if I leave everything the same, and install stroker kit 416, how much do you think I would pick up?
Thanks,
Greg