How much ET will i pickup with following changes

I had the convertor made for this combo when i swapped to the 904
I know its slipping in high gear excessively. But the first 1/8 mile and the 60 foot showed excellent gains.
It needs tightened up in the back half.
Putting a stroker motor in the car in the offseason. Will have it cut open and adjusted to that. Right now just to much going on to take it out and send it out
We just missed on it some. PTC built it for me