Yeah, apparently they bored & stroked the original 3.3L V6 minivan motor to get the capacity up to 3.8L, so there's not a lot more room to move capacity-wise. Here's the info from Wikipedia:

"The 3.3 was bored and stroked (3.78 in/96 mm and 3.43 in/87 mm respectively) to create a 3.8 L (230.5 CID/3778 cc) variant.[1] This EGH version is built at Trenton Engine in Trenton, MI.

The 3.8 got an increase in power of 12 hp (9 kW), for a total of 162 hp (121 kW) in 1994 via a new intake system. In 1998 the compression ratio increased for a total of 180 hp (134 kW) and 240 ft·lbf (325 N·m). In 2001, the engine got a Variable Intake System which boosted output to 215 hp (160 kW) at 5000 rpm with 245 ft·lbf (332 N·m) of torque at 4000 rpm.

It is now last used in Jeep Wrangler."

http://en.wikipedia.org/wiki/Chrysler_3.3_engine

I believe the Wrangler version doesn't use the variable intake mentioned above though, so only makes 202HP at the flywheel.

 

HESCO just released a stroker kit about a month ago for 3.8.

 

No numbers on their site. According to their forum, stroking alone puts less power than a SC but you can combine the two.