XF EST Distributor Setup for XC crossflow?

My distributor is tired and the lobes are worn. It came with the 1976 XC crossflow and has done 750000 since 1992, plus 220000 on the clock when I got the XC. Installed it in the reco motor fitted in 2000, low compression 250 ironhead crossflow with hardened valves, dual fuel, w/ pacemaker headers, rejetted stromberg bx with 14 inch air filter (yes, that is possible).

So now I m considering an upgrade to a XF EST dizzy with a MSD6425-6AL. Hopefully I can get a new old stock XF EST dizzy.

Question is, what are the three wires coming out of it, from left to right?
Can I retard the advance back to 6-9 degrees with the MSD (more advance and the standard 250 pings)?
And will this combo work with my Bosch GT40 coil? Or do I need to get a better coil?

I assume this will be easy to install and wire up or am I missing sth?
 
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