Auto 79 Camaro Posi Tract

Hello all recently I started fixing up my 79 camaro, and I'm looking for a good community. I'm looking to put a 350 430hp engine in it. I'm getting it ready for this job. I just redid the entire front end suspension lowered it 2inchs. Now im getting ready to work on the rear. I plan on getting a 800+ hp rated driveshaft, and a floater kit. Before I do this I need to decide on what I want to do towards the Alxe. Please Help

Would it be easier for me to find a axle off a junk yard for my camaro or buy a http://store.summitracing.com/default.asp?Ntt=powertrax&searchinresults=false&Ntk=KeywordSearch&DDS=1&N=115&target=egnsearch.asp

Does anyone know what size axle and length or what car I should pull it off of for my 79 camaro?
I'm going to have a drive shaft made to fit.

if you can live with a 8.5" 10 bolt, which you probably can....just rebuild it. the powertrax kikt is a good unit and easy to install. it's not as picky as most posi's on road surfaces. it's designed more towards good traction than it is turning corners, but it will do so without a sound. sorry, no idea on the demensions

The camaro is definitely not my cornering car.
Thanks for the info.
Much appreciated.