I have reviewed the older posts on this topic and I am looking into doing this conversion on my car. Here is what I have learned so far. The 4 lug Aerostar motor was discontinued by Ford long ago. And, all of the reman companies that I can find no longer offer the original casting in a 4 lug configuration. The original casting is needed because it offers the clearance required to clear the original lugs on the regulator. It appears to me that the 3 lug motor ( which is abundant ) has its 3 lugs in the same position as the 4 lug, but is simply missing the 4th lug. It may be possible to fashion a strap to create a new hold down in place of the missing lug. Has anyone tried this or does anyone have any updated info on this topic?
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