Congrats on a good first outing. 121mph is enough to get you way down in the 11's.
If you're really going to race it more, a transbrake is the easy answer to getting good ET's. My car did about the same off the foot brake the first day, and by the end of the first night with the trans brake it went
10.99@123mph.My current converter will only stall 2300 without boost. Its taken some time for me to get the timing/fuel right so that it spools up quicker, but it definitely can be done.
Another thing too is that playing with the timing can be worth a lot. My car picked up 3mph going from 21deg of timing to 24~25deg last time I went to Norwalk.
Congrats. 121mph in that pig is making some good power!