a built trans and what stall speed for a TVS blown truck?

[JeRM82]

I am looking more into the 80 conversion...I saw that crossmember and the haness on that website....its a LOT cheaper for the crossmember than I thought....if I switched to the 80E what level do ya think would be enough?
I keep thinking that if I got a level 5 4l70 it would last me a little over two years without breakage....and THEN I could step up to the 80E if it poops the bed after I go on my first deployment when I rotate over to sea duty and I can do the level 5 80E with a new driveshaft without breaking a sweat financially....I DO have the cash to do the conversion but if I did the 80E I would be tempted to put a 14 bolt in it and a new drive shaft so that I wouldn't have to even toutch the rear of the truck again....and after I did the 80E conversion I would have to hold off on that blower for a WHILE.....what do you guys think?
What level 80E would be enough?
Would the 14 bolt be worth it to step up to while I am making the tranny swap with the bigger driveshaft parts?
Will the cal-tracs kit that I just bought work with the 14 bolt?