Ok, unless the valve is bent, the rod is bent, or that piston was machined wrong, those pistons will work with those heads.
I better be right because I have 2 of my own motors I’m putting together with icon pistons. One has edelbrock heads and the other TrickFlow. You only need to put that head back on and use clay like was suggested. Even if you remove that spring, check that the valve is not bent and push it down into the clay by hand, you’ll know if it fits the pocket
Stealth is the same as Edelbrock 2.14 and 1.81, so there is more room for the exhaust valve with the TrickFlows.
All 3 have the valves in the stock location
Then you’ll need to clay it up, like fast68 suggested and check with your new cam

http://store.440source.com/Pistons/departments/7/