I have a 6yro off the track that was born over at the knee. He is sound just looks funny. Are there any others that have had experiance running barrels on a horse like this and did it cause any issues?

Over in the knee isn’t that big of a deal. Back at the knee...I wouldn’t touch with a 10’ pole. Those ones are the ones with soundness issues. Over in the knee tend to stay sound as long as the deviation isn’t severe.

It looks so ugly but all in all hes solid on it has no problem catching and holding his leads never sore or showing any fluid on his joints..

All conformation defects are fine, until they aren't.  You will find stories of "my horse is over at the knee, he's now 29 years old and never taken a lame step"  or "my horse is back at the knee, he's never taken a lame step in 28 years".  If a horse has a conformation problem, it may not be a problem today, but the chance of it being a problem tomorrow is higher than a horse with correct conformation.  If you already own the horse, I'd just go for it.  If I was buying the horse...I'd think twice before doing so.  

How many outs did he have? What was his record? How long did he run? How much did he win?  Was there a significant decline in his speed index? 

Knowing how to read a chart can tell you a lot. 

His stats aren’t my concern. We train race horses for a living he had no issues with any of that he has a 95si no joint issues no fluid always sound. My question is what is the chance of them remaining that way when I start asking him to make tight turns? 

We had a horse with a 106. He had a significant decline. Then it stayed low. Turns out he had a broken pelvis. 

The left front doesn’t bother me. From your picture, the right looks a lot worse. If that is the case, the difference in severity would worry me since they legs aren’t the same degree of defect.