Need Chevelle 12 bolt decoding

[LSxChevelle]

So I know it is a 70-72 Chevelle 12 bolt by the casting # 3969278 NF

I want to know what year...

Axle stamp is CKD 0619B2 (is it 06/19/70? or 71? 72?)

From rear on passenger side web is cast F30

Thanks,

Jason

[MONTE7071]

Its for a 70 Chevelle CKD 2.73:1 ~ 12-bolt (L48/350-4 & LS3/402)* Buffalo shift 2

[LSxChevelle]

Its for a 70 Chevelle CKD 2.73:1 ~ 12-bolt (L48/350-4 & LS3/402)* Buffalo shift 2

Thanks! The original 350 is in it so I'm guessing it's a 4 bolt based on the 350-4?

[MONTE7071]

I think they mean four barrel. It is very possible that it is a two bolt. Are the last three digits of the casting number 010 if so they are good blocks and pretty common.