My car was drag raced by previous owners. When I got it, it had "railroad iron" traction bars on it and the front TM bracket welded to the chassis.
Incidentally. I'd recommend replacing the TM tubing with 3/16 DOM tubes. The TM tubes are too thin for 500's.
I've seen lots of 66 GT350's with bent arms. Some, just from being strapped down to a trailer with.
I would EXPECT a good set of slicks to bend them up pretty good.