While taking apart the transmission, I took some measurements with a digital caliper. These are probably different from other 914s out there, but I wanted to record them here in case I lose them amid the rapidly increasing paperwork.
Distance from edge of flywheel to engine housing: 1.684-1.687 inches at various places
motor adapter cone depth: 1.318 inches
motor adapter socket depth: 1.373 inches
4th/5th gear shift fork to bracket on shift rod: 0.127 inches
2nd/3rd gear shift fork to ridge on shift rod: 0.202 inches