That's impossible to have B body suspension on an a body car.
Firstly, there is no way that a B-E Body upper control arms will fit in an a body.
Those UCA's are way to "wide" to fit.
And the "shafts" that are in lower control arms are different outer diameters, and overall length between A body, and B body cars.
You need to do some homework, and find out exactly what you have, and what your working on.