FBO kit is well worth the coin. A performing engine needs its base time set for a quicker curve , with a tail up at the high end.

A dremel tool can enlongate the slots to give a few more degrees for the in between.

secondaries don't open until it is driving , pulling a load. Also don't just throw the yellow 2ndary spring in. The engine needs to pull against that spring to produce velocity. The holleies need to be set up , then they rock out.

use a vacuum advance distributor.