Along with dialing them in, make sure you take a look at the bell near each bolt hole. I found often the radius of the bend comes into play and when tightening the bolt, it tends to shift the bellhousing. I had to spotface a number of them on the last two I installed.
12 point capscrews help this a littlebit, but they too, can shift the bellhousing when tightened.
Just a heads up.
Paul