Internal/external balancing

cudamark said
Near as I can tell, it's around 04/01/72 when they changed over from forged to cast cranks. If you're going to swap in a forged crank in place of a cast crank, I'd rebalance the engine, get a '72-up 318 harmonic balancer (so you don't have to modify your crank pulley), remove the weights on your torque converter (or get a 318 flywheel if your car has a manual trans), and reuse your existing timing cover and water pump.

Way ahead of you. Crank is at the machinist now and has been balanced with the new pistons and rods. Flywheel is a 4 speed unit for a 318 forged crank. I want to pick up an aftermarket fluid-type damper with the correct timing marks for the cast crank timing cover...which is why all the questions in the first place.