Here is a quote from the CT forum. There are a bunch of guys on their using the 33 boxes for drag racing.
"i have a wrecker spec box with a short shifter i only put oil in it because it was empty in the frame of mine its cheap lets break it then think about something different it did 4 years on the road running in the 11s @ 130ish mph at the track then another 2 years of drag only running 10s @ high 130mph with full slicks and 6800rpm two step launch and still all good. It has been through 2 blown clutches, 1 smashed centre bearing, 3 broken uni's, 1 pretzal tailshaft, 2 folded lower control arms and then 2 broken axles. I pulled it down thinking i should look at the damage NONE wasnt even fillings in the oil THEY ARE TUFF "
Look at getting a Jim Berry clutch if you are worried about it failing. Twin plate should be under $1500. He will talk you through it and let you know the best clutch for your application.