I have an 87 Iroc with a stock rear end with 3.23 gears according to the chart here at the site without posi and I'm assuming its 26 Spline. What are all the parts I need to get to so it will hold around 450hp and a kid driving it

Thanks

 

http://www.ws6transam.org/10bolt.html

<-- do everything that says

.... and then according to experts you should be good for 400hp. One thing I was never sure about if that 400 they through out in there was at the flywheel or rwhp. I am assuming flywheel, but that's only because I planning to build an engine with roughly similar numbers

If I were you I'd start with 4th gen rear just so you can get disks at the same time and you can probably find one with a posi and a ratio you want. That's what I did and I decided to keep original posi until it becomes open diff and then I'd probably put auburn in there.

Also there is a better cover made by TA.