You should be OK with a stock forged crank and rods, and depending on the amount of boost you plan to run you might even get away with stock-replacement pistons, though I wouldn't advise that unless you really know what you're doing. My thought on oversize pistons is always "the smaller the better" to leave as many rebuilds in it as possible. Find a cam with as little overlap as possible, negative is actually better). Every Slant Six needs head work and oversized valves but I can't remember the standard sizes to which most guys take it at the moment. I would suggest going back to a solid-lifter camshaft on a Slant, but others may disagree with me on that one. The stock hydraulic system is wacky in it's function, but fine for stock applications. Use the best head, intake, and exhaust gaskets money can buy, and again, depending on boost level, you may want to consider ARP head studs or bolts.
Your Super Six carb probably will not work very well with turbocharging unless you have a source for tuning parts for it, because boosted engines prefer to run pretty rich in comparison to naturally-aspirated engines under full power. Most guys that I've seen are using Holley 4-barrels with boost-referenced power valves (BRPV) to enrich the mixture while not over-jetting the hell out of the engine in non-load situations. If you don't plan on intercooling it, water/meth injection is a must-have if you're going to try for serious power (you can actually use windshield wash for this and most guys do because it's cheap). Prepare to take a whole bunch of timing out of it, too.
There is much to learn when you're thinking about turbocharging; it's a different world from what you've learned about naturally-aspirated engines. My suggestion would be to join over at
www.theturboforums.com and spend a couple of days reading before you ask any questions. They have a Mopar section, and there were several Slant projects around last I looked, but don't limit yourself to that area. Look around, see what others are doing, and learn the basics before you post a question. It's a bunch of good guys, but just joining and posting "How do I turbocharge my Slant Six?" will not get you any answers for the most part.
I'm a member over there, but under a different username. I've learned a lot from those boys, and though my currently-stalled project is MPFI, there are tons of guys using blow-through carb setups making a ton of power. There's a poster over there named blown385 whose Chevy truck is simply astounding with a carb... 15+MPG, daily-driven, and tapping on the 9s last I read.
It reminds me of an old children's book, "Putt-Putt Joins the Parade".