around $600-$700, you need t make sure the stally is chockers with transfluid before you put it onto teh trans, it will slide nicely onto the imput shaft and you will have to feel for the engagement of teh stator inside the stally.
for 202s make sure that the crank has the locating spigot in the back of the crank the little knob in the centre of the converter locates onto this, without it you'll **** up teh trns in a big way as the trans as the converter wont be held truly centre onto the back of the crank.
the stally is for engines with high performance cams that shift the HP and more importantly the torque higher up the rev range, they have a bit of "slip" down low to allow the engine not to be loaded up as much in gear so it wont stall at idle, thats a crude explanation of part of their function but theres more to it, pick up a brochure from TCE or someone reputable and they generally answer all your questions.
i have an informative brochure I scanned, if anyone know how to post up images...