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I believe if you move the snap ring up you can remove the old can, at least that is what i recall from the instructions for removing the can.

Dan E.
69 SS396 4spd. 4.10 posi. x66 coupe
 

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Saw this in the MSD forums fwiw:

Echlin #VC-1810 advance can

Modified engines with more cam that generate less than 15” Hg. of vacuum at idle need a vacuum advance can that’s fully-deployed at least 1”, preferably 2” of vacuum less than idle vacuum level so idle advance is solid and stable; the Echlin #VC-1810 advance can (about $10 at NAPA) provides the same amount of advance as the stock can (15 degrees), but is fully-deployed at only 8” of vacuum, so there is no variation in idle timing even with a stout cam.
 
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