Rod,
Shame to see the engine come to such an end. Considering the extra stroke and 8,000rpm the piston speed would have been similar to a non stroke cossie revving to 9,000rpm let alone the massive Cyl pressure.
For the new engine it may be an idea to look into alloy con rods and an alloy flywheel to help reduce the rotating assembly/mass. At any given rpm, having a lighter rotating assembly will make life easier on the main caps/studs as the load on the main caps/block will be influenced by the rpm and the mass of the rotating assembly.
The only down fall for the alloy rods would be that they do have a “life expectancy” meaning that they would have to be changed every XXXXX miles of usage as well as the fact that you would have to compensate for “rod stretch” at high rpm's so inturn allow more clearance between the piston crown to Cyl head face.
Best of luck on the new build
Jake