Reverse manual valve body questions

You guys have been super helpful.. I got a lot to learn.
Glad I asked before I put the car on the track.
The seller didn't keep records but said the trans was done by JW (they're local) last winter and he said he counted 11 timeslips since.
What I know:
727
RMVB
No brake
8" converter
B&M shifter

This might be a good place to ask this... Foot braking - Is it better to leave on the (2 step) 3k chip or 'flash' the converter from about 2k or so?