Here's a good one about dual shocks!
When I bought my '89 Suburban last year, the PO had installed a Pro-Comp lift kit. They did it themselves, the owner could not speak English, and his buddy was the translator when I was buying it.
So the lift kit came with 4 shocks, front springs, and rear blocks. What did they do? Stock rear shocks, all 4 shocks up front

You can imagine the ride I had driving it home 3 hours from San Jose. Sunday night even. The rear would buck, and the front was so incredibly stiff... well, you can come up with your own saying for that one LOL!
It's all fixed now. Well, all it took was new springs all around, as well as new shocks all around!
If you are looking for new shocks, I'd go with a modern set of singles. I always recommend Bilstein; they ride pretty well. If you need something custom, they will work with you on getting what you need too.
Clay