Well the problem they are having is that there's a vibration in the car. They were thinkin it was the flywheel. So they called today and I looked up an 11" flywheel for a 360, and the only one I could find was for a Magnum pickup. So I don't know. Maybe I'll tell them to try the Mag FW, and have it re-balanced, but what would a reputable machine shop use for a reference? Have them balance it like the old-style 360 FW?