something is wrong!?
Put your car on diet.
Change to a 9 1/2 inch converter,somewhere around 3800 rpm
Set timing around 35 all in at 3000 rpm.
Your hp is 450 rwhp off your weight and mph at the traps.
Your cars working well according to your trap speed versus et.
Change to a 750 Holley.
Here's my street car that runs on 92 octane gas.
750 holley dp.
took out the 100 octane and put in 92 octane.
Went from a 10.82 et to a 10.71 with just a gas change.
Built car to run 92 octane.
This time is off the juice.
Threw the mufflers.
Street car Street sleeper.
If I put the 3.5 tires back on the front it would 60ft time better.