dumb question? is it a four door? (not sure if there were such a beast) the front doors shouldnt be effected unless you just want them gone to help with weight issues and to put on some cool bars.
K5 is a 2 door only. Four doors would be a sub unless it is the newer tahoes they came as four doors. 1984 K5 is a 2 door. A dovetail should not affect the doors at all unless it is an extreme dovetail.