That is like saying you are building a 350 Chevy. What kind of oil pan do I need!!!
Fenders, pro street, power, tire size etc, etc, etc 9", 8.8, 8" 10 bolt, 12 bolt, wheels, Resto mod
There are lots of folks here that will help you out but you have to them some additional basics of your build.
Oh and welcome to the site since it looks like a first post. And no, I'm not always an old grump

!!!
Dave W