Eagle,
It is not recommended to run a DF engine on a test stand. Why would you want to do it?
It's not very safe and if you don't have the shroud and ducting in place you will not have adequate airflow past the head and can easily overheat. Wait until you have it mounted properly in the plane.

That looks like an early Mig with plywood wing spars in the photo. The early ones had a twist in the fuse that causes the plane to roll right. If you have one of these you can notice that the fin is not straight and the rear stab is not horizontal. You need about 1/8" of left aileron trim to get it to fly straight. In spite of that it flies great. Just be careful on your first flight until you get your trim adjusted. If it really bothers you you can make a former that fits inside the fin to straighten it out. That's what I ended up doing to mine. It really didn't make any difference in how it flew, but looked better.

Also you should reinforce the wing mounting and fuelproof the plywood formers. After about 130 flights one wing departed the fuse at full speed causing the Mig to go in.

Good luck,
Joe