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You're using a "normal" 727, aren't you? I'm not sure how that operation was handled on the 500/518 boxes, and I don't remember what the 518 I just got looks like. IIRC, the kickdown was on the opposite end of the TB from the throttle/cruise cables, using the same bracket. You might be able to whip up a tidy little bracket to mount on the trans and use the Maggie cable to pull on the 727 lever.



I used the Bouchillon kickdown cable kit (which I think is just late 90s Ram Van cable). Scratch made the brackets from some sheet aluminum. Found an old pic from PHR.
http://www.popularhotrodding.com/features/0309phr_1970_plymouth_mopar_barracuda/photo_02.html