[Jeff Lee]

Under FRAME it allows joining of factory front / rear subframes in Stock. No mention of roll-bar.

It is interesting that AMC provided subframe connectors on the '68-'69 Rambler. I've been told it was for the V-8 only.
From what I've seen, a 343 Typhoon V-8 Rogue with a factory T-10 4-speed and 3.54 rear gears (or steeper) could hold it's own in a street race back in the day! I would guess headers, a Holley 750 w/ an aluminum intake and 4.10 gears with 7" slicks could add up to a high 13 second street car.
I once had a '69 AMX that had a bone stock 343 with a 4-speed,
3.54's and street tires. It was good for 96 MPH in the 1/4.