7 bolt valve cover heads

Can I use 6 bolt big block fabricated valve covers on a head with 7 bolt holes, can get a deal on them hope I can use them.

Is it the middle hole on the intake side of the valve cover that's missing?The Ford Racing 429-460 Valve covers only have 6 holes in them.

Later Mark.

yes it is the middle top bolt on intake side of the valve cover, guess they will work, shouldn't have alot of pressure up there you would think just two bolts would keep it from leaking oil. Thanks for your time Tom