With the current configuration, I would have to go with 9.00's at 140ish + mph.
I do think there is a better cam for the compression that the motor has.
What are the flow #s of the heads you are using?
We had an experience with a motor in a top sportsman car I helped with last yr. that had 15.5/1 compression. It was a 598 c.i. motor that had to run a 4.70 index (1/8 mi.).... The motor run fine but needed nitrous to run the #. It was in a 2600 lb 98 camaro. I know that it took a 300 shot with a fogger. That is all the motor would handle. With 15.5/1 comp. there just wasn't enough space to put anymore nitrous in it. The car was running h. 4.80's-l. 4.90's with config.
Hurt the motor at half season and rebuilt the motor with 13.5/1 compression. Now it had more space to put more nitrous in it and wa-la it could handle a 450 shot and now runs L. 4.60's. That made it easy to slow it down to a 4.70.
I did see in your pics with the nitrous solenoids and thought I would pass some info along.