The Mopar deep pan is a VERY good set up. It will rust without some kind of paint,if you paint it anything,make sure you wipe it off with some lacquer thinner or something because they are coated with an oil to prevent rust. The 727 and 904 pan was close to the same price till last year,I don't know why they went up so much,like said already,it doesn't cost any more to make one or the other.
Billet aluminum pick up was a BIG improvement over the previous steel one.
If you get chrome,sand the gasket surface with a dual action sander.
Rigid rubber pan gasket part number is 2464324ac
Ground clearance is not a problem.