I assume the street avenger is a holley? You should put jet extensions on the rear jets just to make sure that is not the issue. With out them, the rear jets can come uncovered on the launch . May require a different float. Also, get that temp down! Leave at 135 to 140 if you can get it down to that for the next run for tuning simplicity. You may need more fuel all around, squirters, jets, etc. Jet for mph, squirters for 60 ft.
Do you have a cold air kit? A well sealed aircleaner base with good airflow, like a Moroso dropped air cleaner base?