The KB bar is NOT NHRA approved. Its more for stiffening but not a ROLLBAR. Removable rear cross bar will not be safe and not be NHRA approved. Swingouts will work and are NHRA legal to certain ET's and speed.
I ran into the same problem using 55's, stock rails, 03 pump & tank, NO boost-a-pump. I replaced the rails and now have great A/F (11.5) out past 7300 rpms.
My 3650 has held together for around 100 passes, 75 stock and around 25 with some nasty hp and tq on a solid rear. I'm sure it will break this year and will be replaced with an auto. But its still going strong for now.
Traction control is gone on mine. Custom tuning can get rid of it so it will never come on. We did this so the fuel didn't get leaned out under boost and loss of traction.
You better get some forged parts for your botton end or you'll be replacing your motor just like he's going to have to do making 570 on a stock block. :nonono: