You should follow along with this guys thread:
http://www.forabodiesonly.com/mopar/showthread.php?t=49548
IMHO, he is setting it up for ALOT of fun and although he has a nice budget (on the parts he has already purchased), the same can be done on a more effecient budget and get close to the same results.
He also has a thread going on the most popular Turbo V-Eight Website...
http://www.theturboforums.com/smf/index.php?topic=120629.0
And there is ANOTHER mopar owner doing up a Dart turbo build:
http://www.theturboforums.com/smf/index.php?topic=120439.0
I personally think its a great idea....I would use a good ole' low compression 318 as the initial foundation (I wouldn't even crack the valve covers/Oil Pan off) and later build a special 360 to shoehorn into the ready to go Turbo System Engine Bay.
At 14.7 psi, a turbo can DOUBLE the Hp/Tq, the same Naturally Aspirated engine made....so figure it like this...300 crank horsepower can be doubled to 600 crank horsepower with boost....its relatively safe...run good fuel and always make sure your Wastegate is dialed in, and I hear of people running big numbers on stock Cast Piston/Crank bottom ends all the time.
I say DO IT!
Good Luck.
