Operation "is this a proper 70 key cylinder"?
This cylinder will not lock into place in the steering column housing. The detent you see there seems to be too big to go into the locking hole of the steering column housing.. Or, is the steering column housing incorrect? The hole of the housing is smaller than the extent on the key cylinder.

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Troy
Houston Mopar Connection Club
'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi)
'69 Charger 500 440 - 4speed - 3.54 Dana
'70 Road Runner 383 - 4speed - a/c (now with 440)