I would recommend the following method :Take a 3-view, at best with
given dimensions and then you can calculate for yourself, if length is
with or without the pitot. Bonus point of this method : You can easily
decide, if it is a good or a bad 3-view. ;D
I've done this for the first 3-view of the T-38, I've found on my HD and
taken the very first data, too : length 14.10m, span 7.7m .As span should
be unaffected by the pitot, I've got .. (see sketch below) :

But with the use of more than one 3-view and more than one set of data,
it should be possible to determine the correct dimensions, I think.