Top of pump towards the block advances timing. I would recheck the drip timing first. It sounds like you used the overflow method. Some people reported issues with that.

On the older cars the dash idle adjustment did have to be advanced sometimes either to start a cold engine. Or get a reasonable idle till engine warmed a little. Some of your descriptions sound different for a rebuilt pump. I would first verify the pump to engine timing again. I have three cars with that idle adjustment...