The Silver Eagle models were just "special editions" of other McCulloch models. There were SE models based on the Mini Mac, 3200, and 600 Series saws. The were concurrent with the other models being released.
I will also try the 3720 with a grey bar, the 3420 that I have has a nice brushed Total bar that Joey Taylor put on it, that one looks pretty nice too.
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The 600 Series coils also work on the 10 Series electronic ignition saws but you have to shorten the spark plug wire. I am not aware of any other saws, trimmers, or blowers that will accept the same coil as the 600/10 Series saws.
All of the Mini Mac and Power Mac 6 saws use the same bars. There were 14 and even 16" bars available for the Mini Mac/Power Mac 6 saws but they were more for reach than for cutting large diameter logs. Due to the shape and location of the rear handle it is not really practical to cut logs over 12" diameter with a Mini Mac since you can't really make use of the "spike" to help lever it through the log. They are nice for trimming up small diameter limbs but I don't like cutting much over 6-8" with a Mini Mac, Power Mac 6, over even the 300 Series saws
The Mini Mac 165 (I think there was a 155 as well) did have an extended rear handle for better leverage but they still didn't have a decent spike available.
Mark