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You don't need to go distributorless/HEI to do this. You could use MegaSquirt for ignition only with the Duraspark distributor. MS can also controll EDIS or, using the megasquirt extra code, wasted spark coils or CNP/COP's in a wasted spark configuration. With distributorless you would need to attach a missing tooth wheel to your crank.
With the MS/extra you can do table switching. So if you are running gas you could use timing table A then if you switch to pane you could switch to timing table B. Otherwise with standard MS code you would have to hook up your laptop and swap tables.
Edit; MS is essentiall the same type of thing that Leve posted. You would not use the O2 sensor to adjust timing however with MS you can use the e85 sensor from GM to tell the computer what mix is going into the engine. It then adjusts the fuel based on the mix. From what I have read on MS, timing is not changed for e85 vs regular gas.
The sensor you would need to adjust timing is (I think) an ion sensor.
84 CJ7 HO head, MegaSquirt, T18/D300
88 S10 Ext Cab 4.3 Auto (sold)
Last edited by bleoh; 04-28-2008 at 12:26 PM.