a higher stall converter will let the engine get in its powerband quicker. Example. Car A has a the stock converter, say 1500 rpm stall, and is fitted with a cam that comes on at 3000 rpm. Punch the throttle, the engine will lag for a moment until it picks up the extra 1500 rpm where the powerband comes in. You have a 1500 rpm difference where the engine will be down on power. Now lets say car A has a the same cam but with a 3000 stall converter. Punch the throttle and whammy, you're right in the powerband, accleration goes through the roof, you're putting more torque to the wheels, in general its just a great experience, LOL. Seriously, a converter makes all the difference in a performance application. Get a converter that stalls at at least the cams minimum rpm range, maybe even higher. If the cam is listed as 2500-6000 rpm, go with at least a 2500 stall, or even better a 3000 rpm stall.
I agree that the FMS cams are getting outdated, however they are still good cams.
Personally, with an AOD, I'd go with 3.70's or 3.89's, a 3000 stall converter with lockup, and a cam with around .520-.530 lift and 225-230ish dur at .050. If you go with a 2500 stall you wouldn't really need the lockup and you'd save some dough, but your holeshot wouldn't be as strong.