Help w/B&M Converter 2400 Holeshot

BTW,I had the convertor your using behind a 402 and a 350 in a chevy nova,it acted stock at idle/cruise and flashed around 2k in the 350 and 2200 in the 402 with 373 rear gears.I had a friend who used the same convertor and it was really loose up stairs and never acted right,I guess it just depends on the luck of the draw.