So if I use a Scat cast-crank hit for 408 cubes, it would still be externally balanced and I could use the original balancer? Should I up-grade the balancer and flex-plate? Will a 360 balancer be enough weight for a 408 or should I use something else? I would still use a weighted torque converter for a cast crank 360? Which after-market balancer would keep the stock pulley alignement? Thanks...