Not sure how far you are on your Project, but please check out theturboforums.com as they have a Mopar dedicated section. I was into mine around $4,000 including A2W intercooler, fuel system, and snow performance stage III meth injection kit, but purchased nearly everything used or on sale.

Stock exhaust manifolds won't work on the BBM like they will on the SBM applications, hot side will more-than-likely require a custom setup (add in another $1,000+). I built a rear mount setup which cost $350 in total for my hot/cold side tubing, fitment, 5" stainless downpipe, and labor at local welding shop.

If I wasn't running a B-Body, I would definitely have a SBM and run factory exhaust manifolds for a front mount setup.

I run a 440RB, Mopar .525 solid lifter camshaft w/ 112 LSA (budget turbo grind), Eddy heads, 10:1 CR, Victor 440, CSU 750 BT carb, and BW T6 S475 w/ 1.10AR.

Attempting to build a street car (with the RB series) and a turbo is a bit difficult to accomplish in the limited room underhood, unless you go twin T4's (which isn't really worth it as the blocks are supposedly only good for 700 tops N/A, 800ish FI). S475 will make 700+HP all day with limited amounts of boost on a healthy big block. Just remember, larger turbos do not require radical PSI to make power. Corky Bells 'Maximum Boost' is the bible of turbocharging literature, and honestly a must read if you are serious about going forward.

what are you guys doing for fuel / air? tuned carb or going injection?

EFI for me.

I think misunderstanding is where this always goes wrong. People ask if they can "flip" stock manifolds. If "flip" in your mind is up side down, than no. They wont fit. Spark plug holes will be covered. If you mean left on right/ right on left... well- depending on what they came off of, and what they are going into, they may work. There were alot of different configurations of factory manifolds for big blocks. My first use of turbos was with mid 70s New Yorker manifolds. I cut and welded them with ni-rod into the configuration I wanted. Pretty ghetto, but they worked. Plenty of guys would use stock manifolds in stock locations, make a pipe from one to the other, and weld a flange directly onto one of the manifolds for the turbo.In the 70s/80s Turbosonic made a 440 manifold with the flange cast into it that made its way onto many Winnebago motor homes.
If you don't have a modified chassis car, stock stuff will take you far beyond what the car will hold. Spend money on your fuel and ignition. EFI covers both bases at once. Carb can be expensive and will never get you to where you can be with efi. Price both and you will find efi is not much more if you aren't afraid to do a little hunting.