Here is an Eagle rotating assembly with 6.0 h-beam rods, forged SRP pistons, cast crank and internally balanced by CNC Motorsports.
Eagle Street/Strip Kit, SB Chevy 350/383(87-99), 3.750' Eagle Crank, 6.0' Eagle Rods, 9.8:1 SRP Pistons - SB Chevy 383 Assembly kits - Eagle Street\Strip Rotating Assembly Kits - Eagle Rotating Assembly Kits - Rotating Assemblies | CNC Motorsports | . This Scat rotating assembly from Summit Racing says it is internal/external balanced so I am assuming it comes with a neutral weight balancer and a weighted flexplate. This is because of the one piece rear main seal. You can call Summit Racing to make sure.
Scat Engine Rotating Assemblies 1-91250BIE - SummitRacing.com