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Holley vacuum advance--Y block

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Help! I've uncovered several Holley vacuum advance units sealed in their original boxes, but cannot find an application for them. The Holley tech line is no help--in fact they stated emphatically that they never made such a thing! The part # is 35R-83A and they look like Ford Y-block, but I don't know for sure. Any help would surely be appreciated.

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This WOULD have been good information--they're a single diaphram. If my skills hold up I'm going to try and get a couple of pictures on as well. Wish me luck.

post-37801-143137933099_thumb.jpg

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