As the cam timing goes up (especially overlap, LSA & intake closing) the converter stall speed needed for easy traffic, prevent a stall on hard braking, etc. use goes up. Remember this may require additional ATF cooling capacity.
Unfortunately, more cam also lowers the stall speed with any given converter, so the cam choice has to be made first. Beware of "3,000 RPM stall" converters for PG, TH350, 400 etc.: these are rated with a 350" V8 engine, your stall speed will be lower.
