Hmmm.
Didn't realize you could get any gear in the 455HO except the standard 3.42 due to emissions laws. A body was 3.55's. I tried to order 3.90's in mine and was refused. Dealer got notice that it was not available in anything other than 3.55 unless air was ordered and then they were 3.31's Optional gears were only available with the 400 in the a body. Don't know F body but would imagine if available in A body then available in F body also.
There may have been 3.08's available also. Does PHS documents show optional gears? Just curious.