I think the changes are going to surprise you, and you will be a solid .20 or more quicker. You are increasing the motor size by five percent, the heads flow that much more, and the cam is bigger by more than that for sure. If rest of the package is close, the motor will pull very hard down low, and you may be able to shift it below 6800 and still go as fast. You could also run less gear. My 528 with 2.30 intake valves and full porting only wants 7100 rpm for best ET. I am also thinking that glide is going to love the extra cubes and compression.