I run a Stewart pump setup on my Vintage Road Race 66 Shelby GT 350. For road racing this would be the only way to go!

As far as the balancer, that will depend upon the clutch/flyweel type that you intend to run. Triple disc Tilton or Fidanza aluminum flywheel/clutch setup, the balancer weight and size needs to be sized/sourced based upon the complete engine/turbo/FI package which you state above that you do not have at this time. Spend a little time deciding what the final package will be so you do not buy "any" parts more than once!

Whatever you choose, make sure it is NOT one of the "rattler" type of balancers. They may be great for drag cars however they are not for road race cars. Just ask any Cup engine builder.