I would give that Quadrajet a try.
You will only be out the cost of a spacer an gaskets.
Make sure both spacer gaskets cover ( fully ).
The intake to spacer gasket and the carb to spacer gasket should have 100% coverage with no gaps or you will have a vaccum leak.
Then if Quadrajet doesn't run good,Try the Holley it may run okay?
JMHO
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