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I can address one issue right up front. The "new" for '67 A-bodies were not "widened to accommodate the B/RB/Hemi engine families ". Stuffing a BB into one of them tiny things in 1968 was a last min. response to the very fast changing market for musclecars.
I don't think it was even in their wildest imagination when they were working on the redisign years earlier.

"You want to stuff a WHAT into that Dart???"



100% incorrect. Chrysler engineers were playing around with a 66 Valiant with a 383 stuffed into it. Plymouth had the 383 in a 67 Barracuda early enough to be in a Dec 66 magazine (think magazine lead time). The dual exhaust provision was in from DAY ONE with the 67 a-bodies even though every 273 had single exhaust.