FWIW, Some of these may not be real friendly to an Abody with a 2 speed wiper motor. AC can even be an issue. Below is a "shaker " base plate on my 440 six pack. It only needed a small bend to fit under the motor and the rubber seal cutout....
My '72 air grabber 4bbl base plate might need to be notched or possibly do a 3 speed wiper motor swap to fit...