Note that the 1969 (design) Camaro was produced until that time in 1970. They were registered as 1970 models....my son had one.
For some reason the new style 1970 Camaros were late in getting into production.
The other1970 GM vehicles were introduced in the Fall of 1969 and had Power Beams.
Gene I don't think Power Beams were installed on 69 GM's,except some VERY late 69 Camaro's as you mention above.
The 4 headlamp T-3's ran through the 70 and 71 model years.I am not sure when the 2 headlamp GM's transitioned over to Power Beam,which is what this thread is about though.Just wanted to clarify on the 4 bulb set up.