You cannot convert to the 3.8 because it is a 60 degree V6, unless you want to do a lot cutting and re-engineering, not worth the expense...
The above post will do it however!!
it's been done. i've seen one in a beretta, but you're right, a lot of parts are custon made.
for the same price, i agree with the turbo kit
99 GT - top swapped, S2X cam. - sadly, sold
96 Firebird Formula - T-tops and exhaust leak. 14.26 @ 97.8 - sold
2008 Chevrolet Cobalt SS - stock, in all of it's turbocharged awesomeness