Pontiac TriPower website listings for choke tubes 61-63 imply that different choke tubes may be needed for applications with the PCV spacers than for applications without PCV spacers.
As I remember when I added the PCV spacers on a 61 manifold I used the choke tubes I had with no problem. However, those tubes were probably from a 64 which is a slightly higher rise manifold and may have need the longer choke tubes.
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