The crown can be difficult to make judgements by, although It´s usually centered or high.
My ´63 EBOF has a high crown, and my ´65 EB-3 have it placed in the middle like both my 1967 EB´s.
I´m inlaying a 1966 SG melody maker these days, I´m completing a ´standard´conversion with a normal headstock.
I took my caliper and measured my three high crown basses, just to compare.
Just to find that none of them was in the same place
I ended up just throwing it in where it looked right, like Gibson probably did too!