After i replace my cylinder head, and while testing the compression by inserting the gauge into the spark plug holes, what should the appropriate psi reading be on a 93 escort wagon?

130-150ish
But what ever the number is, all 4 cylenders should be about 5% from each other.

5%? Jeeze. I always read "within 30 psi of the highest cylinder." Mine runs at 210 psi, and does fine with it. If the 2nd gen 1.9 is anything like the first (assuming that's what you have in a wagon), then it should hold up to 250...which is pretty stinking high.