i must be completely missing something ?!?

I must be completely missing something here either that or people's memories are foggy as hell when they're talking about this 30 years ago they ran this or that time? just putting a cam and a torque converter and they're running 11.98 and 12.2's? I'm sure most are well aware of my combination and it's still relatively new and I have a little bit of tuning to do, no doubt, but? My best time so far is 11.88 ? I'll go ahead and restate my combination and maybe someone can tell me why I'm so far off/close to these relatively stock combinations? Or is the simple answer they're full of crap!??

73 duster gutted 2730 lb's without me
410 stroker scat - crank and i beams
icon flat tops with valve relief .010 above deck
ported 596heads 1.88-1.60 new valve guides, new seats, Crower Springs with smith brother pushrods and 273 rockers
284 / 464 purple performance cam was given to Ken at Oregon cam grinding and turned into a custom solid lifter 259/267 @.50 - 546/566 lift (before lash) 107 Ls
dual quad tunnel ram - edelbrock 1406 front and carter afb competition series 9635sa on back (primary)
stock ignition
4 speed (pistol grip )
8 3/4 410 spool traction bars and pinion snubber (ajustable)
28x10.5-15's M/T slicks

shifting at 5800 and going through the traps about the same.
I can see the 1.88 valves holding me up a bit but i'm sure thats not the whole story here?View attachment 20150531_122338.jpg