I've had 7 5.0's from an 83GT to an 84 Capri to an ex trooper car etc. And with all those cars, not one had a power adder and it has killed me. I know its right to do an HCI first then adder, but man it's awfully tempting....
well seeing how you have messed with alot of N/A stuff i would try a blower. something different to mess with. either way you go it will be a huge power gain and will go real fast.