Heard back today from my engine guy that my block, crank, rods and pistons are all crack free and good to use for my new engine.
M30b32 bored to take Marle forged pistons, takes it out to 3430cc (same as a standard M30b35)
Meanwhile, while this is happening I have been putting together my new intake manifold with new modern Bosch electronics, injectors, throttle body etc, will be using a hybrid Megasquirt EFI unit.
I'm going to fit this new EFI system to my current engine that's in the car first to make it all work before fitting to the new engine.