What rear gear and rear tires and what size engine is in it now? The reason I ask these questions is my dragster had a 700 hp engine with 17x33-15 tires,run dead on the # everytime. I put my big engine in it & it would not go down the track. It took me many months & $$$$ to get it right,hope you do not have to go through all that. When you get everything right 6.98-7.06. It's worth every $$$ to be able to out-run them big block chevies heads-up.
PS don't let anyone tell you it won't repeat the # with the big engine. And when they see the Big # it will run when you line up beside them if they don't go Red on the tree, when they get about 1/2 track and look back and see how far back you are...then they will give you the race. On alcohol it would not hurt to bump the CR up another 2 points.
PS a Big engine is nice but be prepared it will break parts that you did not even know you had.