904 race build

So just an update,
I have installed a ati sprag,billit servos, 4.2 lever,multi front drum spring,blue frictions when done,red front band,kevlar rear band,new pump gears.
Dropped off pressure plate at machine shop to have .025 taken off.
Still debating purchasing a low band apply vb but still not sold on it.What brand company would you all recommend?
I have aluminum four pinion planet's from another case but not sure how they hold up?I just put the rear planet gears on a scale steel versus aluminum and they are one pound different. Thanks guys for all your help it's appreciated.
Ok so earlier in your thread, you said you lost the sprag, please explain why you think it failed and why you are not sold on a low band apply valve body. Why do you think the sprag failed the first time.