Idle's better, there's quite a bit less noise, and parts wear more slowly. As far as a noticeable gain in horsepower or torque, it's doubtful, because the specs are nearly identical. I have been debating whether or not I should take the '93 TBI roller cam out of my Duster parts car (not the 3.0L '94

) but I'm not sure it would be worth the time and work I'd put into it. It does need a lifter, though, so I may do it after all. With the roller cam you'll lose a little bit of duration, but I don't think it's really enough to matter. Parts wear-wise, though, it's a pretty easy and cheap mod. All in all, don't really think you're going to notice any difference whatsoever switching stock cams.
forwardmotioninc.com has a pretty good selection of their own stuff.
Check fwdperformance.com for valvetrain parts, too they tend to be a little cheaper.
turbos unleased (dot) com is a good one as well.