I'm far from a racing guru, but with the amount of power you are running and the violent launches that car makes you should really get a better drive shaft. I was at LISST dyno day years back and saw a stock drive shaft let, go not the u-joint either. It was not pretty. Would hate to see yours let go at the type of speed that you are running. You have great looking car and it is a cheap item to replace compared to what you have in your setup.
Best of luck with the new setup.
1996 Impala SS DCM , with the usual bolt-ons .
Best 1/4 13.79 1.80 60FT. Cecil 3-19-05
2006 Ford F350 6.0