Your foward band broke. This is a classic symptom. It'* also a pretty common break. http://www.tripleedgeperformance.com...or_3_only.html
At 220K and being rebuilt you can expect that he'* going to do the clutches. There'* a few valve body updates that would be nice to have done as well. http://www.tripleedgeperformance.com...nd_Valves.html
Then there'* some parts to consider:
4th clutch shaft http://www.tripleedgeperformance.com/Upgrades.html
Input shaft http://www.tripleedgeperformance.com/Upgrades.html
V8 chains appear to be the stock replacement as they have possibly discontinued the V6 chains and replaced with the stronger V8'*.
Being a rebuild, I'd expect it to come with a new torque converter. 2500 isn't a higher stall than stock. Stock we stall close to 2700. I know ATSG manual says differently, but thats where things like the k factor come into play from what I've heard/read. A good stock replacement should treat you fine.
Toughest part to think over would be the input shaft. Most of the time guys don't break them until they are well into modding and a lot of power. It does happen though.