You will get some warping. Actually it will just make some high and low spots but you can just hammer and dolly those back out. I actually didn’t get any from doing the heat extractor cutout. But then I did when I welded up the old emblem hole. Go figureOn a side note , I'm thinking of doing some custom work on my stock hood over the winter ( 393w )
Do you see a lot of warping from welding in the center of the hood ?
Steel is pretty thin in that area.