trans info needed

Question one:Add clutch packs in direct drive,install a 5.1 lever,add a Transgo shift kit.Question two:put your foot on the brake/gas pedals.Slowly apply the gas pedal,watch the tach.The rear end should lift on the springs,then the tires spin. That is your stall speed.
Question three:If it has leaks,lack of ATF in the pan affects stall speed,reliability,and stall speed.Real world?Find cam specs,or use a vacuum gauge.Is it low vacuum? My guess?Big cam, no converter.Good luck.