I believe you should be running around 115 with that much HP. Dont know what cam you have but shiting at 5500 seems kinda low. I had to baby my Challenger off the line and ran 115 at 12.3 and I had less hp. trap speed is a sign of HP..but your trap speed does match your ET pretty good, imho.

BTW, I love your car!

---

Here is my engine................

505 cubic inches
Heads: 906- valves, exhaust 1.810, intake 2.140 -ported & polished
Compression: 10.5:1
Intake Manifold: Rick Allison Cross Ram
Carbs: (2) Edelbrock 600cfm (stock)
Exhaust: 2” TTI headers w/ 3” TTI exhaust
Cam: Bullet- Hydraulic roller p/n CRB 298/303-12HR
Duration at .050: intake .240 exhaust .246
Gross lift : intake .567 exhaust .567
Cam in at 106 deg
Ignition: Mopar distributor w/ MSD 6AL2

If it would help the Dyno graph is on web page. The dyno #’s are with manifolds not the TTI’s

A&A Transmission 727 , stall converter Dynamic 9 ½ 3500 stall
8 ¾ with 3.91 and 28x10 Hoosier DOT drag radials