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

Back a few decades ago I guess my interests were always sharpened by what was in the mags and who claimed whatever had the OHhhhhhhTEAaaaaaaa" factor. ThenI beganto see for myself the interesting details of all the old Mopars.
Sure I rather have a model with a metal grill than a piece of crap plastic one. Rather have a 426 Hemi than a 318. But I built cars that I found interest in and began to enjoy the hobby way more. And as I go older the need for seat the pants torque and speed deminished. Tooling down the road, chlling.. that can be cool no matter what motor propelles the Mopar.