Yes the chrome stamped sheetmetal covers. The reason I ask is because they have a channel for the gasket to fit into., they are not flat like the cast alluminum ones.
Again I'm guessing but am pretty sure this is what most people want, not the aluminum ones. If an engine has the chrome sheetmetal covers, there is no doubt in anybodies mind that it is a 427 and not a 428. 428's never used the chrome covers.
Just trying to help you out.
