Assuming the 12 bolt you have is for multi leaf, the 3 leaf set up will be a good choice too. Single leaf 12 bolt was a '67 only axle.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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