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Okay, the tab on the timing cover goes up to 15, so I guesstimated and set it to 18 degrees initial BTDC. Set the idle back down to 700 rpm. Now getting 17 inches manifold vacuum and idle is cleaner. Took it for a little ride and it is happy; no castanets and easy starting. Will revisit in more detail later and will not be afraid of a more bumpty cam in the future. Thanks.
Before you call it done, check to see how much total advance you have with the vacuum disconnected. 36 degrees total is about the maximum you want. If you haven't welded up the slots in your distributor, you are probably well past that if you're running 18 initial on an otherwise stock distributor.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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