A-833 OD in Aspen... not the right one?

may i ask what the deal is with these trannys? are they good...will they hold up to a 300 400 hp motor/ I would think the od factor would be huge for some guys running a steap rearend gear........i saw one of these recently for sale guy was asking 800 bucks!!.........even at that....sure beats the price of od keisler eh?