Thanks Jack! I plan on limiting my RPM to 6,000-6,500, and will put a decent spring on the valves, but don't expect to exceed lift by .550". I will run a flat hydraulic lifter (not sure which one) with a good rocker arm and push rods. I doubt I need to go to the expense of an SFI balancer. The balancer below would seem to meet my needs, with medium duty design.
One more question, my motor was balanced during a rebuild by the previous owner with the OEM balancer. If I changed out the balancer do I need to have it rebalanced?