Line up doors

[Max]

Whats the best way to line up the swage lines on a 33 pickup?
I have heard that its best to bolt down the cab on its mounting pads and then use a couple of porta powers to jack diagonally across the door openings to line up the doors. Other people say to shim the cab to get the swages to line up. The rear of the doors need to come up around 3/8ths of an inch.