How well threaded are your cad apps?
If your apps can use all 8 threads of the FX-8350, then it will do better for that.
On the other hand, the faster cores of the 3770 will prevail elsewhere.
Here is a link to a comparison of several environments:
http://www.anandtech.com/bench/Product/551?vs=697
And... for 5% more cost, the 3770K can be overclocked to give you 25% more performance.