I run the Crane and it works well and it has rotory adjusters. No chips to change just set it with a screw driver. I've used MSD 6 (also a good product, but have to buy chip set for rev limit) I've not used Jacobs, so no input for you on theirs.
Bill
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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