More thoughts on heads. The stage V mopar cast iron heads will be your best starting point for a small port head. The other option is what cast iron replacement heads does ma mopar offer in large port. The good engine builders on this sight will know what is better, but I lean to the small port for best torque and the ability to set the port window to a little larger size if it will help. These heads meet the cast iron, factory numbers rules.
A lot of the build will revolve around the final rpm the valve train will allow, combined with cam selection. Good luck on the build, hope you can dyno it and post it here.