I might be able to find an extra fuel line to experiment with. I have a buddy in Chatt that has a few bits and pieces laying around. I'm in Cleveland and planning a trip down there this week.

I might be able to locate a fuel distributor for that engine if you need one. No promises but I can ask.

I believe the cold start valve injects gas into the intake manifold during the warm up period. That might be enough to make you think the idle is a little better.