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No issues with the vacuum canister hooked to manifold vacuum on mine and I’m running on California’s finest 91 octane. Just need to make sure your tune is in order. Like I said, some like ported vacuum, some like manifold vacuum.

I did a lot or reading on this and recently added vacuum advance to my 68 340 (actually 372 CID) Cuda. I run it off of the manifold vacuum and am running a pretty good sized cam that creates low manifold vacuum (252/257 @ .050) at idle. The slight increase in advance at idle (if any) allows you...