A buddy put me onto this - Howell EFI builds a conversion kit for older Chevy small blocks from carb to EFI. They build marine grade kits and claim to have converted over 1,000 boats. The harnesses are built for each application, but they use mostly GM parts. If you have an older boat and want the EFI, and have about $1,500 it is an option. It is not drive by wire, so ZO is not an option. However, PP is an option since it uses stock GM linkage.
Karl DeLooff - Powered by the wind