That's what I am reading to. It seems that the important factor will be the shims or crush sleeve. I would still like to find some kind of tech article before I put this pig together.
If you are going to use a 489 gear set, I'd highly recommend getting rid of the crush sleeve the factory used. I use the solid pinion spacer (availible from randy's or richmond) and set pinion bearing preload the way you'd normally setup a 741 or 742 casting.
Why do I say get rid of the crush sleeve? I've seen them come loose in racing applications, and some nasty carnage as a result of the pinion slamming the driveshaft forward, trashing the transmission/front pump.
If you need some pointers for setting it up, gimme a ring. HTH's