Wright Cyclone R-1820-C9HC info required

Hello
Could any one clarify what the 9HC Cyclone was installed into? I believe the tank versions were the G200 and the helicopter variants were versions r1820-84 and r1820-103 giving 1525 and 1425hp respectively. Would I be correct in saying that the 9HC at 1350hp wasn’t used in the helicopters???
Also I’ve been looking at a 9HC engine that only appears to use one magneto but yet on the pictures on the web you can clearly see 2 magnetos on the cyclone. Is this one mag correct or am I missing something??? Any info on this or the where abouts of a wright cyclone for sale would be appreciated.
Thanks