The 3-4 allows a lot of flexibility and creativity in regard to blitzing. But you have to have a legit NT and basically 2 freakish DT's to play the DE spots. I think Bresee and Werner would thrive. Granderson in no way shape or form fits the system. Foskey should just be cut period.
Granderson could play the Josh Sweat role. They're both the same size. Sweat is more athletic though. Both were only targeted in coverage 2 times last year. He's basically just a wide 9 edge rusher.
The only thing that changes (switching to a 3-4 under) are needing a hybrid OLB (to play the Nakobi Dean role) instead of a 4-3 end.
In either scheme we need to upgrade our 1 tech and 5 tech (our current bigger strong side DE: Cam/Tanoh/Turner)