What convertor for a 482 lift cam

Stock converter will work, BUT, you may be disappointed in the sluggish feeling on takeoff. I run a Comp cam with a little less lift and with the 2.76 gears that were in it and the stock converter it was a real dog on takeoff. I'm also running a 318 presently going to build a 360/408. Once I got into the powerband of the cam it was OK. I switched to 3.55's and that did make a difference but still a little doggy from a standstill.

When I rebuild my trans I will be looking at a custom built converter from, most likely, PTC somewhere in the neighborhood of 3200 stall.

It really depends on what you expect out of the car. For a little stoplight to stoplight fun you will want a little more stall. A custom built converter would probably be better than an off the shelf one in the long run. These companies will ask for all of the specs on your car and intended usage and build one accordingly. It will perform better from a standstill and still have decent street manners.