Key is making it stronger - which would require upgrading your gears and potentially the cluster (or countershaft) - depending on how you go, you may need to upgrade your mainshaft as well (if you go with the z-spec T-5) - all of this really makes one consider alternative options like buying the rebuilt tranny outright. I would call Blumenthal Mfring - I dealt with Larry Church when rebuilding mine, which I did to stock (replacing cluster and 3rd gear) - he was immensely helpful in discussing options to 'strengthen' the T-5. In my case (and perhaps yours) - if I chose a heavier duty T-5, it became very apparent that it was cheaper (or at least much more cost effective) to buy the entire tranny from them built, dyno-tested and warranteed for w/in $100 of buying all the parts separately, and then I don't have to rebuild, which wasn't trivial in terms of time. But since I stayed stock, it cost me much less.
http://www.blumenthalmfg.com
D&D are good guys and were also helpful, though I haven't purchased anything from them.
Hanlon I've had trouble ever getting someone on the phone and they've never answered a single email I've sent... are they even still in business? Their website is still up but I can't get through...
good luck, definitely get the video, it is excellent and essential!!! Worth every penny!!!