Lets just say for the sake of arguement, I have a draw of.. 10 amps for ign sys, 20 amps for ele fan, 5amps for fuel pump (yes holley's run all the time), 15 amps for the 2 halogen headlights, 5 amps for the gauges... Already at 55 amps!, that without the small draw of LED back lights. So I believe that a 65 amp is gonna be needed just to have some charging even with a draw of approx 55 amps. Mind you this is all saying everything is maxed out, my old saying better safe than sorry. I just don't wanna come to a stop at a light and see the headlight dim due to not enought rpm or/ie power to run the draw aginist the system.