Has anyone bracket raced a 8 speed hemi ram succesfully?

Hi all,
Due to health reason I might not be able to race my race car (71 duster) this year. I am looking for any tips to bracket racing a 15 ram hemi for consistent times. I am not looking for best performance just most consistent. Is it more consistent to keep the engine, trans warm? Or too cool off between rounds?
Thanks

My buddy won the track championship for the 13:00 bracket at Thunder Valley Noble Oklahoma with a new 2015 Super Bee. The car was new and never gave him any problems.