Never swapped an E4OD for a ZF5, but I have swapped a C6 for a ZF5 and I was able to use the crossmember and driveshafts from the C6. You will need a flywheel, clutch disk, TOB, and pressure plate for an IDI. You will need a manual transmission clutch pedal assembly. You will need a master cylinder, line, and slave cylinder. Make sure the ZF5 has the fork and bood with it. If it doesn't, you'll need them. You can modify your trans tunnel pan or you can get one from a manual transmission truck. You'll need a shift lever and boot if they didn't come with your ZF5. I'd get a firewall reinforcement plate from Terrapin Manufacturing and install it before putting the pedal assembly and clutch hydraulics in. You can pull the auto crap out of the steering column but you don't have to. I did as I can't stand for that stuff to be there and have no function.
Several folks have swapped E4OD's for ZF5's, so they will be along here in a while to fill in the gaps.
Heath