Your going to have quite the impressive ride there, Omar!
I used the G-Force Performance RCAE4 cross-member. It is extremely well done. http://www.amazon.com/G-Force-Performance-RCAE4-Double-Crossmember/dp/B00JLTVCS0
As for the drive-shaft, I chose to have a 3 1/2" chromoly tube cut and balanced, with billet chromoly 1350 yokes. http://www.jakesperformance.com/Slip_Yokes.html
Likewise, the pinion yoke was changed over to 1350 as well. http://www.markwilliams.com/detail.aspx?ID=322
Only use the solid u-joints with your combo, not the greasable units.
Doug