I'm getting ready to mount the spring perches on my van-width 14 bolt, and have a couple questions... 1) For location of the spring pads-can I measure the distance from where the axle tubes are pressed into the housing to the inside edge of the spring pad for placement? I have a regular-width 14b that I could take this measurement from....just making sure this is the correct method. 2) I intend to use the ORD shackle flip, and possibly the 57" f*rd springs. Should I rotate the mounting pads so the pinion angle is a tad higher...say 2 degrees? Thanks in advance for the help.