14.45 with 12 sec combo... HELP

hi guys
I'll tell you my problem. i have a 1976 duster with this combo:

360 - .030 over
KB107 pistons
stock rods and crank (ARP bolts on rods)
587 heads - ported and 2.02 valves
Torker 2 intake
Holley 750 DP- 73-82
crower camshaft 267-271 - 474- 485 lift (267hdp)
dana 44 with spool -391 gears
TF904 - transgo
Dacco 2500 converter
26x10 slicks
MSD 6AL 5500 limiter
true dual exhaust - 2 dynomax super turbo - no x pipe


yesterday I went to the track ...
my duster was moving, did not go right ... my best ET was a disappointing 14.43. the track havent 60 foot- mph, etc... only ET

what happen with my duster???... We expected 12.90 :???::???:


HELPPPP