Be wary that you may have to machine the lower bearing/mount of the front shock as it may be too wide to fit on the lower control arm of your 320. I ordered all three today to see if any of them have the narrow lower mount.
Also if you are changing out your old shocks for new because your 320 drifts/jumps while going down the road, you might look at your upper rubber bushings, tension rod bushing, or sway bar bushings as these will cause more steering and tracking issue than bad shocks. And being 50+ years old the rubber is probably harden, shrunk in size, or missing pieces parts and is not doing its job. My '63's right side upper bushings have disintegrated, so it has excellent camber for drifting.
I'll do some digging for new bushing info/compatibility.