New Best on Friday Night!

My setup is almost the same except 67 dart/3360 lbs with driver/home ported OEM heads/pro products airgap/demon 750DP/3200 tight convertor

You should be running around 89-90 mph
Best so far for me is 11.86 with a 650 Demon DP
75* at sea level
60' 1.631
330' 4.828
1/8 7.525
1/8 MPH 90.98
1/4 11.86
1/4 MPH 113.43

I just changed to a Demon 750 DP and ran the car the other night. Had to up the front pump shot from 31 to 33. Also did jetting and got it close with 75 front/83 rear.
My metering blocks have 3 emulsion bleeds all have .030 bleeds. MAB is 39 and the fuel curve stays around 12.7 at WOT. I'm going Wed night and upping the front jets to 76.
I realize you have a Holley but they all work the same.
Definitely check fuel pressure. My car has 3/8" fuel line and a $20 stock pump.
My guess is you need to jet up a little and see if your mph changes. I always make 2 runs after a change to verify good or bad.
Hope this helps and have fun.