difference from earlie to late A bodies

I don't know what kind of price you ar getting , but it might be simpler to convert the front to coil overs using the existing K and components.
It requires some fabrication skills , but I have seen it done with pretty decent looking results over at www.bigblockdart.com .
I haven't searched the archives here , but I gotta believe a few members here have done the same thing.
Then , you just buy the shocks and make the rest.
Tubular upper arms are nice....nicer if they have heim joints instead of solid mounts , but I have seen pics of this done with stock A arms.