[north]

This is a great thread! So much info to digest. All documentation, especially factory has to be taken with a grain of salt. Some 69 examples of errors:
1...much of the early factory documentation states that the 400 RA (ram air 3) was rated at 360 horse and the RA IV was 366.
2...all early brochures and powertrain charts etc in sales manuals and MPC's list base engine GTO's with auto trans and no AC as having 3.36 but I've never seen anything but 3.55 gears in almost 50 years of owning and parting 69 goats
3...early power train charts and brochures show 4 speed manuals as an option on fullsized cars (in fact only TH400 and 3 speed manuals were offered in 69 big cars and only column shift)
4...Product information documents, press releases and brochures all show dual exhaust as standard on Bonnevilles, this did not happen, it was an option as in previous years unless you ordered a 428 HO which came standard with duals.
5...late (from early May) production 4bbl cars (all models except RA IV)) were built with the "1970" intake manifolds (they had closed in spaces between ports, unlike earlier ones).
6...very late production (june plus) engines equipped with power steering often have the formed 1970 alternator bracket instead of the two small straps of earlier 69 cars.