how bad is this frame damage?

[rsx858]

So im doing a ground up ITS RX7 build and i picked up a running 88 rx7 to start with.. the owner was not aware of any substantial accidents the car may have been involved with and at a glance it looked pretty good. Now that I have stripped it down i noticed what looks like a kink in the frame rail. Its on the passenger side and is right beyond where the front of the subframe bolts up. I dont see any substantial damage on the exterior of the frame but im not very knowledgeable about how these things get repaired etc. Take a look at the picks and tell me if i should scrap this tub or if its fixable.. are there particular measurements that i can take? I want this to be an immaculate build! so dont want to start with a flawed tub.

Thanks!