re. '86 5kt. MAC 11B or MAC 11C ECU? which one?

[urq]

... I'd expect an '86 to have a MAC-11B ... ISTR seeing the MAC-11C in '87. 
I've got the binaries for both somewhere ... my recollection is that the 
MAC-11B code runs the engine a little less lean.  I don't think there's any 
"bug fixes" ...

As noted, they are interchangeable ...


> I've Seen both - Mac-11C is more or less a bug fix for the 11-B.  Both are 
> interchangeable.
>
>
> > which ECU does the '86 5000 Turbo Automatic use?  MAC 11B  or MAC 11C?