The Gen V "Bowtie" block had fuel pump provisions, I think--but they wouldn't have used it for a crate engine.Seeing how there's a mechanical fuel pump bolted to the block there's no way it could be a GenV.
SOME Gen VI blocks had fuel pump provisions--but not the ones installed on the vehicle assembly lines.
The incompatibility was in the block, not in the heads. The Gen V block was an engineering mess; which is why the Gen VI got the nickname "Gen Fix".I'm still weirded out as to how GenV heads on a GenVI block are OK as vise versa is not so much from what I understand.