Just some random thoughts...

If buying a SA truck, I 'd think you'd want an 85 for the EFI.

Know that you will want to swap the steering.

I was in the same boat. In the end, I did the SAS. The 85 I had was nowhere near as nice.

No regrets for me.

There is a difference between an SAS'd suspension and a modified stock. With the dropped hanger you can run flatter springs, the shock mounts are more " real ", longer springs, superior steering...What I mean is, to get a 85 suspension to perform like an SAS'd one, you are going to replace a number of components. With an SAS, BOOM, you're done. Well, not really BOOM, it's work, but you know what i mean. Like I said, for me, no regrets. I'd do it again.