I'm still planning on doing one. 4.375x3.91, I have a 77 400 block I will be starting on soon. Not sure of the heads, but I would like to use the stage v conversion hemi head on this 470. Would have to find them second hand now that they no longer make them. This would be an interesting package because I see no one doing it. I like to be different, just as most go roller when I want to see want can be obtained with a SFT.