A mid to low 2000 stall converter would do just fine. You'd be looking at converters for the 4L60e and not just 3800 in general. You would have to make sure it bolts to the flexplate though. If the factory V6 camaro converter is in that range it should be alright to use.

Circle D is a very well known brand in the LS world. Might be worthwhile to broswe a few LS1 tech threads on converter compaines to look into.