38" is correct, measured from tip to the BOTTOM of the cup.
5 quarts stock recommendation, but Ford upped that to 6 quarts on the Boss Mustangs to lessen the chance of the oil pickup sucking air during heavy cornering use.
I'd run 6 quarts with a stock pan.
Many owners upgrade to the "10" quart pan, that includes internal baffles, to avoid cornering oil starvation problems.
Larry
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