Hi Jack - 

If you have the chance to go back to where you were fit into the AP2 and hit the MBs I think that would be very beneficial.  The AP2 and MB heads are different and you may require a different shaft for the MB.  You should be OK to use the same length and lie measurements taken from your AP2 fitting but you should be aware that the thinner sole of the MB will have different turf interaction than the AP2.  

With the advantage of the Titleist SureFit system you should be able to accurately determine what your specs using the MB will be and if they differ dramatically from your AP2 fitting.  

Good luck and please contact us directly if you would like help finding a local Titleist fitter.