if you need to shorten the engine , there used to be an adapter available to fit a holden water pump
on to the front of a clevo.
i think from memory that dellow was making them.
i had a mate that put a 351 clevo in his Nissan 720 4x4 ute. he used one and had to move the radiator to the front of the support panel to fit it in. very tight.
that was about 10 years ago so hard to say if they still do them.