I read the series with a great deal of interest as I have a very similar combination. This said I was wondering if you could tell me what plugs you are running in the aluminum heads and what your launch method and rpm are (transbrake or footbrake)
Have you tuned the caltracs any further since your series and what are your 60 fts like?
My combo is as follows;
69 RS SS
461 cuin, GM perf. parts ovals, solid roller 252,262 dur and 650 lift, Wiend 7546 intake, 10.5:1 compression, eagle rods SRP pistons etc etc.
Trans is Coan racing TH400 with 4200 rpm nitrous convertor with brake running to a 9" with Locker and 4:11 rear gear. Frame has been tied and I have a 6 point cage. Run 275-60 MT drag radials with Southside bars, CE eng shocks and 60 ft with wheels up 1.57-1.60 with 3800 rpm off brake.
Still dialing things in has so far run an 11.54 at 115 best.