Overdrive 4 speed linkage

No, that takes no special parts as you know. Just a pressure plate and disc.

I converted my 64 Barracuda to 10.95 big block clutch in the 70's using a 71 340 duster bellhousing and home made parts. That 273 was crazy. Brewers sells the parts to do that now.

Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists
Good to know. Another post to bookmark.