I would like to see some dyno testing on the dual plane, I bet a lot of people will be disapointed, think about how sharp the turn the lower runners make into the heads ports. The problem with the 6.1 is it heats the air up real bad. If you are going EFI the 6.4 is probably the best. Carb I would think the Ritter tall intake would be best.

I am not causing global warming, I am just trying to hold off a impending Ice Age!