Success here for clean install on Z77 DS3H Rev 1.0 - Intel i3 - GT 640
Started from Mojave. Installation process :
1. Create an install USB key
2. Install Clover 5070 on this USB key (send me message for what to check if needed).
3. Place FakeSMC, Lilu and Whatevergreen (last version !) on EFI Clover Kext Other
4. Very important : Rename H_EC to EC (follow this guide :
https://floppyblog.com/guide-how-to-update-your-hackintosh-macos-mojave-to-catalina/) or directly for this board apply the patch with clover configurator or hackintool
5. Reboot on USB key
6. Launch the installation (note that if you don't apply H_EC to EC patch, you will have black screen)
7. Once Catalina is installed (launched with USB key), install clover 5070 on Catalina partition (but I have an error that clover is incompatible with this version of OS ?!)
8. So open EFI partition with clover configurator and paste the EFI folder of your USB install key (copied before from the USB install key)
9. Reboot on hard drive (Catalina partition) and you're done !! Absolutely all is working !
Hope this help ;-)