How much change should I expect to see???

There has been a few changes made to my car since it was last run and I was in search of opinions on what I should lose or gain in 1/8th mile et.

Before the changes the car ran consistantly in the 4.80 to 4.90 range in 85 to 90 degree weather at 150+ mph.


We changed from a mag to a digital MSD 10
We changed from 42% overdrive down to 35% ( Lost a couple pounds of boost from 38 down to 36 so )
We changed from old style solid aluminum wheels to brand new light weight SFI wheels. I would say a loss of at least 20 pounds rotating weight on the rear of the car.
We changed from 33x17 Hoosiers to 33x17 Mickey Thompsons


The track we are running at now is going to be at much cooler temperatures, I would say in the low 70's, and it is at around 500 feet less altitude...


Basically, is the change in ignition, weather, and rotating weight going to be enough to make up for the loss in boost ???? I will say the car seems to run much better with the MSD as opposed to the Mag.