[GTX JOHN]

While you were in the Garage, I would leak down the engine and make sure it is in top shape. I have seen similar big block mopar with that head and compression spin easily that high ( As I recall Steve Wann told me
he rouitinely spun his big block 383/440 stockers to 7700 and laughed at me by being a Sissy).

I do agree that a 488/513 gear would be better unless you are at altitude
like Denver for example.

If I read your posting correctly @ 102 Mph.....I would be also check you
valve train and spring pressure. At 12.70 and 102 8 your speed/ET is about
what I would expect in a Heavy Stocker that was not real high HP.
My kids wagon @ 4000 ft when it ran 12.8 would run 102/03. @ 3700 Lbs
when it was making in the low 310-320 Hp range and it appears you big block
is a bit high torque and maybe a bit better midrange on the track.

I can not recommend enough putting a light low drag racing transmission with
straight cut gears (Probably a 263 low or so) like Pro Trans (Palmdale Calif.) is a heavy lower class stocker.
It is expensive but it Really makes a big difference (Dave does not pay me to say that).
It helped Jr.'s stocker 06/07 in 60 and about a tenth a Half. the 727 with 904 guts is
Even more Dramatic in performance difference. It sounds like you car is struggling on
the index and it is no fun to get in bad Summer air and not be able to play .
I know very well...... it hurts to spend to money, but if you can swing it---Buy the
Best and Only Cry Once.