2bbl conversion for slant six

You don't say what year your car is. If you're doing the swap in an early A, you'll need the gas pedal and cable from an early A V-8 car, or some other arrangement to go to a cable pull throttle too.
Pretty easy to get some more common pedals in there like an F/M/J body pedal, although you'll need to make a bracket out of steel plate to get it in the right place. Or if you want to keep pedals that swing from the floor, a lot of mid '90s BMW pedals might be adaptable.