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

Hey guys,

Came across a 65 (supposed) one owner barracuda locally, that's a slant 6, 4 speed. This isn't the fist one I've seen, but it is the first one I've seen in a long time.

While i'm not gonna ask a loaded question like "what's it worth?" i would like to get everyones thoughts on the desirability of the quirky motor/trans combo. Is it interesting enough to add value? or is it something that most people would pass over for a 273?

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