All Type four cases are basically the same with small differences.
-some very early 411 cases were mag and had no windage tray provisions, very rare.
-bus cases have different drilling for dipstick, oil fill, fuel pump (carb), lifter pressure relief (late cases not drilled),etc.
-similar differences as bus for 411/412 cases.
Biggest issue with using bus or 411/412 cases in a 914 is the dipstick tube.
For 914 the only difference in the 1.7,1.8, 2.0 cases is where the serial number is. I don't know for sure but the euro carbed 914 may have the fuel pump area machined for the mechanical pump.
QUOTE(porschetub @ Aug 14 2018, 02:01 AM)

The 1.7 "E'' cases are a great foundation for a build go
1.7/1.8 are the often best cases for any build, the shorter stroke crank is stronger and has less flex than the longer 2.0 crank, therefore causing less wear to the case.