Not Ranked
LR's, MR's, HR's, like what was stated before pertain to intake port height and shape.
LR's were the first port, with the improvement being the development of the HR's, C3 and better C4 designs. I think the HR was outlawed by Nascar, so Ford designed the MR, with a raised floor as compared to the LR, but with the same overall height of the port. The CJ head I believe was based off the LR head.
I would think the carb height on the LR's would be equal to or less than that of the MR. I think Offy makes a dual quad with a low carb height.
You may want to call Carl's Ford Parts, as he has a lot of these parts, and may know the specifics
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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