Which spacer for 1965 273

Stumpy said

To cool the carb. Yes. Also I read on the forum that the secondaries don’t fully open with this setup without a spacer.

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Gotchya. I will also add I am unsure if the bolt pattern on those early intakes is the same as the later Edelbrock style carburetors and I believe that's what that spacer is for. Maybe someone a little more in the know will chime in on that.