We had a turbo 350 running in the wagon, so we swapped the 383’s flexplate for a flywheel. Our 383 is kind of a crossbreed, balance-wise, that uses a neutral balance damper but requires an externally weighted 400 flywheel at the back of the crank. Virtually impossible to find at a junkyard, fortunately they can still be obtained new because they’re popular in circle-track racing. We ordered a 168-tooth billet flywheel from Hays, which required parts-run number one to the local Kragen for longer Grade 8 flywheel bolts and a pilot bushing. We also ordered a Hays 11-inch pressure plate and high-performance street/strip disc with a 26-spline input-shaft pattern to match the Richmond Super T10, which bolted directly to the new flywheel.