Thank you very much. No doubt the 380/360 is a fantastic motor. But as Greg mentioned, it is soft below ~2,000 rpm. The tight 107° lsa makes for a lopey idle and is the main reason the Dart has manual brakes. BTW, it's a 4.10 SG out back.
For what Greg is looking for, a smaller cam with a wider lsa, dual plane intake and 650 cfm carb will do him justice.
Me, I'm going the opposite direction. Starting to build a 408 stroker, TF heads, Hughes hyd roller cam, Airgap RPM, etc.