I have the same kit and have been doing everything to scale it to the British Shorts Tucano Version i.e. Two Exhaust stacks on the bottom by the nose gear doors.

To find the scale details I did an advanced search on www.google.ca or .com using Tucano OR EMB 312 OR Shorts OR T-27 . You can do a quick look for some images from the images tab.

You'll be there for days.

For a few key web links try;
For EMB-312 version 1536X1024 PICs
http://www.eclecticspace.net/modelisme/tucano.html

For rivet points try the pictures on the kit from Aero FZD
http://aero-fzd.hypermart.net/emb_p.html

For Color Schemes
http://www.fs98fabmil.hpg.ig.com.br/...ml/tucano.html
or
http://www.rudnei.cunha.nom.br/FAB/port/t-27.html

Otherwise I will have to send the 37MB of accumulated 364 Pictures separately.