How do yall set yalls body lines?

[frog210]

Okay let me start of with the truck
74 c10 stock height 8 leaf springs in rear so it has a angle

How do yall set the body lines, I want to get the line straight from front to back, is it more reliable to follow the lines on the cab, then do the front clip then the bed?
My bed is 1/2-1 inch lower than the cab line on the drivers side(I was just thinking of shimming it

(By body line I mean the one line that runs front to back, under the door handle)
Thank for the help
Frog
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