Not Ranked
The 428 Cobra Jet engines came in two versions too. There was the "Q" code which was the low end one. The "R" code had LeMans rods and lower end and some other things and it made more power than the "Q" code engine did. But both of them were much underrated at 335 horse. My "R" code engine dynoed out at 440 horse at 6,300 RPM. A friend who had the "Q" code engine in a GT had his dynoed and it came out at 401 horse at 5800 RPM.
I used to have a book that had most of the block codes in it for Ford engines but I gave it away when I stopped being active in the car scene here.
sorry I can't help with your engine but I don't remember any block code starting with what you showed.
Ron
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