I have a friend with a '01 SS that runs 7.70s with a SY3500 Stall as well. Except he has headers,exhaust,cold-air,pullies etc.
Must be nice to have a quiet ride, yet smack down unsuspecting and even suspecting people.
If I ever sell my LS1, I will probably go the S10/383 route, but the LS1 motor is just too expensive for me, as well as the parts..
Do you plan on doing any other modding to it? I'd like to see the times with ported heads and larger cam, with full exhaust! I wouldn't be surprised to see some low-mid 6s, judging by those who run a little slow than that in a 3600lb car. Anyhow, nice ride..good luck!