Roller cam idle RPM

Yeah your right about the converter.Its a Turbo Action 3800-4200 that i bought from a friend that was running it behind a 440.Havent had it on the track,and im not sure what it will foot brake to.I do know it was a tight converter.I have a Turbo Action reverse manual valvebody also in it.From the 1500 i had it idleing at it was a bang when it went into first/reverse.Ive since lowered it to 1200-1300 and its not bad at all.Just want to make sure i dont screw up the cam from too low of an idle.Its pretty much the same rpm as my last cam idled at,but that was a smaller non-roller.Thanks for your input.I appreciate it