In my Cab 13 Chevy, an army recon Bedford 28hp engine is fitted including the Bedford clutch and flywheel. The Chevy bellhousing and gearbox remain complete. It's pretty much a straight swap, with only the front crossmember needing a section removing to allow the sump to sit in.
I've taken some pictures for you today, since it's in a convenient stage of strip down. Hopefully they show what you need to know reasonably well.
Cheers,
Dan