With my '86 my best was an 11.79 @ 116 with a 1.7something 60 ft. Stock untouched long block, PT51, V4, 50#'s, 3200 stall running 20#'s of boost. You have any DirectScan runs recorded? I think you should have more power left in that combo.
Tom, what are you running for suspension? I never had any luck at that track with drag radials, It took DOT slicks, air bags, nasty burnout and a 12# launch to get me in the 1.7's. The '87 I am going through this winter, changing a bunch of stuff and possibly adding some weight to the rear.
I am running air bags with 15psi on right and 5 psi on the left. I have tubular lowers and otherwise is stock. I have been doing a pretty good burnout and then "try" to leave at about 8psi boost. The bias street slicks do hook better and they are 15 inch rather than the 16 inch wheels that the radials are on. Funny thing is, I can build over 10psi boost on the street with the radials and launch with no spin. They just won't hook at our track. I'm praying a new track just might be the ticket!