Rebuilt top end of engine now carb idles much higher?Please help

Make sure the secondaries are fully closed. Then,retard the timing, it WILL slow down.

If your new damper-mark is off by 90* that could just mean that
A) you used the wrong cylinder as #1, or
B) the balancer is intended for a different timing cover.
The #1 cylinder is the one closest to the rad, usually the drivers side .
The last one to fire before #1 is #2....... they are 90* apart.... #2 is the passenger side front.