Called Patrick, found out there are no 9 bolt hole 11" pressure plates to be had anywhere. Jim Carter printed catalog show them, but their website said not available.
Googled 11" Chevy and Summit Racing came up. They had a 11" and according to the photo it was a 9 hole. I called them and they told me it a 6 bolt that the photo on their webpage was incorrectly showing 9 bolt holes. They told me to call Center Force and Zoom, their clutch manufacturers.
I called CF and they had no 11" that would fit the 46 or 54 flywheels.
Called Zoom they had nothing for the 46 but they had a 6 bolt 11" clutch kit that will fit the 54 flywheel. They gave the clutch kit part number so I then ordered it from Summit Racing. Jeffrey