LSD would be nice in Ol Blue. Started driving her Friday and damn!!! I forgot how hard the full throttle upshift 1-2 and 3/2-1 downshift'* are. Down shifts are hard as hell and and provide a 4-5 foot patch at 30-35 mph.
If you do get your trans redone are you going to change the gearing? Would be sweet if you could get the same gearing as the 4T60E in the 1990/1991 SSE'* (3.33'*).
I'm guessing you are going to be grinning big time at the Nats when you make your first run. I wish I could be there to see it all play out.
To be a little on the conservative side I'm gonna guess you'll see somewhere around 13.27 -13.35'*. But if you do pull 13.1'*.... woohoo brother, only .2 more and you'll be scootin around town daily in a 12 second lead-weight Bonneville and Scott C.'* gonna start feeling a little uncomfortable.
P.*. how are the tires wearing? Slicks coming anytime soon? If so I'm betting your trans will be the mod either right before or immediately following the slicks.
Best of lucks, and you can be rest assured you've got one hell of a crown e-cheering you 'back home' here on BC.