2000 cummins race truck driveline angle

[98silver12v]

i just recently started messing with my rear suspension on my 2000 vp powered race truck and was curious on does anyone know the stock angle of the driveline and how much you could change it to help with the launch at the track without breaking things? i measured the height of the rear of the driveshaft and put it back when i did the leaf under conversion but im wodering exactly how close i got it and how critical it is. i know you wanna keep the same pinion angle or at least close but if im within a 1/8 to a 1/4 inch from where it was at with stock suspension intact is that close enough. the little bit of research ive done ive heard of you can go a couple degrees off of stock angle but was thinking i should check it with an angle but dont know where i started unfortunately ......... any input or help would be appreciated thanks