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Then, you'd probably put Woodley at a stand-up DE position on the weak side...
You'd keep Heyward at the 5-Tech on the strong side, which is basically what he plays now (only now he lines up on the weak side)...
The NT would stay the same as well...most of the time, the NT in the 4-3 under lines up on the right shoulder of the Center, but there's no reason that you couldn't line him up directly over the Center's helmet and make him responsible for two gaps...
Steelers 2013 Draft
1--Jarvis Jones OLB Georgia
2--Jesse Williams NT Alabama
3--LeVeon Bell RB Michigan State
4--Jordan Poyer CB Oregon State
5--Earl Wolff SS North Carolina State
6--Josh Boyd NT Mississippi State
6---Conner Vernon WR Duke
7--Vince Williams ILB Florida State