Need advice for slowing my car down consistently.

Went back and read a bit. Do the above and then take out a little timing,add weight,you should be able to get there but it will take some experimenting. My street car would slow to 11.50's with a second gear leave and the carbs secondarys disconnected. Pretty funny as slow as it was off the line still passing the SB chevy 4.56 geared cars before the stripe despite the large gap in the early part of the track. LOL