Wow thanks for all the quick replies, that answers that!
Indeed McCarthy pg 45 notes that even the 1969 RA3 dropped the 744 cam after engine 709185, so the 744 cam being gone for 1970 makes sense.
I guess the logic was that anybody going for an 041-cam RA4 better be well aware it would be a handful in the winter especially, so they kept the RA4 and its wilder cam, whereas the RA3 was becoming more of a daily driver.
I've had a hobby of "Gonkulating" (my own codes) engines, road tests, and NHRA for many years, so aware of many of the caveats, and how sometimes you can infer things, and sometimes not.
Ideally I like to collect DOZENS of road tests on a given engine, then just step back & try to make sense of them (which of course leaves many questions open).
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