Well, to my knowledge, Camaro wise, only a MANUAl box will have a cast iron cover for 67-8,Aluminum for 69, power assist boxes are all aluminum top cover (at least 69, I know). The special N44 for a Z had the same box, different internal gears. N44 was available in either type, man. & pwr.as you already probably know. Try this CRG topic coverage and see how many turns, lock-to-lock your box takes. If it still has the pitman arm, that could be a good clue 3953227 is the #. Good luck.
http://camaros.org/suspen.shtml#steer
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979
FULL OWNER HISTORY
69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711
67 Super Stock 302 Camaro re-creation