he is not trying to say that its a "special slant six", its just poor grammar and no punctuation.
Mopar 1972 dodge dart Special,
with a slant 6 and automatic transmission.
Solid California car, complete with build sheet
This is how it should read because it is a swinger special (LL23C2)
Just look at the dash and the lack of woodgrain over the glove box and radio section, and also the emblem on the fender shows Swinger special, not the regular swinger (LH23)
I am always looking for Swinger specials because my cousin is into those but sure as hell not for 10k