I snagged a photo of a dual bolt pattern head..
the first picture is of a carb only head. the second carb or EFI.
I'm not sure when Toyota started using the newer casting of if they used it on the trucks at all. They also may have used the newer casting on the trucks but not drilled the other holes. in any case this is not the kind of mod that you would want to do on the truck. it should be left to a machine shop
Also I've read that the EFI uses a different camshaft then the carb model.
