what machine work is required to be done to a standard block to fit PERFORMANCE STROKER KIT TO SUIT HOLDEN L76 L77 L98 6.0L V8

In regards to installing a stroker kit, it involves essentially the same work as reconditioning an engine, however, it will require the bottom of the cylinders and sump flange region to be relieved for clearance. This would be made clear when a test fitment of the stroker is done.  Also, you would need a custom dyno tune upon installation. Please consult an engine builder prior to purchase to ensure your block is suitable.