I have a 1968 F100 Ranger, that I'm in the process of rebuilding...I have NO idea what size motor I'm rockin'. I'm told it's a 390, but the stamped code on the engine block (C7ME-A) says 428 C.I.D. I have a picture of it without the air cleaner, but it may be a bit too blurry to see. I need someone's expert opinion on this...

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