In my opinion you should never have a positive pinon angle on a 4-link dragster. Before you can set the pinon angle the ride height and the upper and lower 4-link bars must be set. Do you know what holes the bars are in and what the ride height is. this will be a slow process without being able to see the car. Does the person who did the work build dragsters for a living. Nothing says he backhalfed it correctly. Don