I would think that the shifter linkage would be the same for any floor shift A-Body.

It shouldn't matter if it was from a small block or a big block.

I reused the shifter linkage from my 273/904 combo and installed it on the 572 Hemi and 727 that went in my car.
I didn't even have to adjust it, lined right up.

Kick down linkage would be different between small block and big block but shifter linkage should be the same.

The big block A-Body kick down linkage is specific to just A-Bodies.
I know it's reproduced, but not cheap.