Just because it has four bolt holes on the one barrel side doesn't mean it won't work. If two of those slotted bolt holes will line up with the slant 6 bolt holes on the intake it will bolt on and work. My only worry would be how high they sit and whether the hood would close.
That worries me too . They said it won’t worl with a slant six . So o don’t know what some these guys are using and I’ve not done one in 14 years or more but I don’t remember it being this hard to just google and find one a s it worked perfect.