Rarity (and desirability) of a slant six/ factory 4 speed?

I don't see any production number breakdown in my book for the 225's in 65. It was a fairly common option and although there may be a fairly low number produced, It wouldn't necessarily be considered rare but desirable. The 225 reduces the value. The 273-4 Commando's are more sought after and sell for higher prices accordingly. I can't tell from photo but it looks fairly clean and worth saving.