Shift Points (904 Auto)

Well my friend and I got my edelbrock intake and carb in, tuned it, and man it runs sharp. However at first it was taking much too long to shift into third so he adjusted a linkage right at the tranny. Well, now it's shifting into third too quickly and not allowing my engine to rev for some good fun. Are we going about this wrong with the adjustments or should I just go down there and tweak it until it shifts where I like?