You may need to look in to a shallow slump pan for your swap, the stock truck pan is going to hang lower then the front cross member and your truck looks like you got a 6" drop in the front. This is the pan in order from my truck and it has every thing needed to swap.
http://www.summitracing.com/dom/part...2593/overview/
I'm just getting around to swapping a 4.8l into one my trucks, after having the motor for about 2 years. Keep up the good work.