I use one of these -

http://www.greatplanes.com/accys/gpmr4020.html

It is accurate and the notches will give a good indication for most any wing or airfoil you put it on. Mount the wing on the fuselage since you want the angles relative to the wing and not the fuselage. Adjust the tail until it is the same relative angle to the wing as shown on the plans. It will be OK then. The device can be used for many years and will pay for itself in knowing that you have a properly set up airplane.

Or

Use the side view on the plans. Measuring from the bottom of the plans to the bottom of the fuselage get a front and aft distance from the bottom of the fuse to the bottom of the plans. Pick points that can be easily measured on the actual model and that weren't broken. Block the fuselage to that position.

Pick a point on the leading edge and trailing edge and mark them. Do the same measuring thing for the tail to position it with respect to the bottom of the plans. Adjust the actual tail/fuselage intersection until the measurements are the same as on the plans.

Or

Lay the actual fuselage over the side view of the fuselage on the plans and adjust the stab seat until it matches the plans.

But I recommend the Great Planes laser thing plus it is fun to play with and shoot across the shop to chase bugs, etc.