In order to press on with this project I will need a couple of things. A bare A12 block with main caps and backing plate, as well as a CA18 RWD block and if possible a backing plate. My boss has agreed to take a look at it and do some measuring when time is available.

Engine blocks are the best to use as they can be set on the CMM much easier and you will know exactly where the thing is sitting. Also, the cast iron is much stronger, heavier and much less likely to distort Whereas the alloy can distort over time. So the most acurate way is to use the block to make the adaptor plate. As for the bacing plates, I have an idea on how to work out if it will work by spigoting the 2 together and drawing a few lines first. If it is obvious that it won't work then there is no point wasting valuable time.

Backing plates for A series and Ca. Who's willing to donate?