340 flywheel mounting

Flywheel and 340 are years 1970. Was in the process of checking bellhousing runout so flywheel was torqued on crank flange. Deformation of flywheel surface under mounting bolts was noticed after flywheel removal. I know flywheel is cast but have never seen this type of damage on flywheel before. The metal looked crushed and fragmented. These are the best words I have to describe it. No pics available. Have already reamed out the damaged areas. All but one of the six holes in flywheel were affected. Have decided to replace flywheel since repair not possible. Has anyone experienced this issue? Does anyone have issues with a McLoed steel replacement.