5.2 Magnum swap into 70s-80s truck

So is it as simple as supplying 12 volts to the computer? I know I'm over simplifying that, and my 94 trans is the 518, still hydraulic controlled, correct? I can use the dash switch to control od/torque converter lockup as well. I'm still in the early spit balling stages here just seeing what's involved. That little Mazda must haul!