Hi Gav,
Although it was many years ago, we at DATZED were rather reluctant to separate the so called "Early Girls" from their correctly numbered components.
Yours being No. 150, we would have certainly suggested, even in the case of an engine swap, that the owner should keep the original engine block for posterity.
We knew that eventually, matching numbers would be a valuable asset.
Sorry to say that our records are long gone, but most of our are memories are still with us...
Tell me a little more about 150. It may just jog my memory...
Dave