Though it was a strange right foot rest but being spring loaded I dug a bit deeper. The carb control rod was attached to a swivel bracket attached to the block via the rear water pump bolt. Another rod extended into the driver compartment and attached to the back of the pedal. Another added option.
So what does it do? Choke.
One should always feed their foot.
Are you related to Christy Stolpestad at the American Swedish Insititute in Minneapolis?
Does it look like this? Cruise control !!
Finally got the picture off my sons phone.
Small picture, but it looks like a Fulton Accelerator, one of many styles of accessory gas pedals that were available when the cars were new: http://www.mtfca.com/discus/messages/257047/329461.html?1356211467
There are still foot feeds available from the vendors: https://www.modeltford.com/item/A-GPEDPNA.aspx