The 3-4 scheme might be good for blitzing LB's off the corner, if you can find guys that can get there. But a 4-3 will help stop the run, collapse the pocket, hurry the qb, and still allow for a LB to blitz off the edge.
We have talented DL's, but they would be more effective in a 4-3. We have a couple talented LB's, but not so much that they can play the 4-3 scheme.
I think we would do well with Ziggy, McClendon, Fangupo, and Heyward as front four, with Jones, Worilds, and Timmons at LB.
I'd blitz Worilds and Jones off the edges, and use Timmons to spy the other teams RB.
If we can get a top CB in the draft, and the DB's continue to improve, we would be contenders.
A 3-4 works if you have a great edge rushing LB, and 3 goons who can collapse the pocket. Steelers don't have that personnel.