I have done several of those conversions... the most common being using a 71 - 80 5 lug rear end and welding on the spring perches... and mounting on top of the stock springs... It would also depend on what ride height you want.. if you switch the spring hangars from a leaf sprung 67 - 72 2WD truck you will loose about 4 more inches in ride height...
Yes any 71 - 80 ...12 bolt 2WD axles should bolt directly into your 4X4 housing..
Attached is a picture of one conversion... using the stock Blazer spring perches with a 2WD axle on top of the leaf springs.. and 1 1/2 coils cut from the fronts springs....
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