Starting Engine block part numbers.

Here is the photo[attachment=15939]T2 & 212 007.jpg[/attachment]






Iv' finally ******* done it !

shovel man

All the part numbers you have posted are interchangeable, and those blocks will work on all the D2s, and D4s up through the U series and other applications. In general when you see a casting number that is a few digits different than the part number, it is because the part that is listed in the book is an assembly, meaning there a couple extra parts included other than just the casting, such as studs or freeze plugs, etc, 4B666 is listed as a block and 4B671 as a block assembly.
The Dash cutout is correct for an early U model with pony electric.
Over the years that the D2 was produced, there were a bunch of different dashboard types, and the parts book did a poor job of showing the different cutouts and bumps, here are pics of some of them.

All the numbers you have are good and interchange as stated.
General sequence is 4B0666 RPB 4B0671 or 7B3058
5F9341 RPB 5F9340 RPB 7H9318 which uses cap screws for the heads instead of studs.