i would start by making the shock angle similar to the A & B-body angle, only with a little less angle. a shock works best vertically, but that is in a drag setup.
i don't know what the dak uses for a rear spring plate, but a shock plate for a common B-body may work, and you could then make a simple upper mount with the angle you want the shocks at.
just throwing something out there.

Thanks moparx

I got under there with a tape measure and after I got my measurements I got busy exploring my options. The best price, adjustability, and quality I settled on was the QA1 star stocker single adjustable ts504. I needed at least 5-6” travel in a package with 12-15” eye to eye at ride height. I need 3” compression to get well into the rubber bump stop and 2” of extension is about what I have right now in body separation on launch which should be tamed a little once I have a shock in there that actually does something.

The options are a little daunting when looking for shocks- a lot of shorter shocks are spec’d for IRS and have very little travel, then lots are spec’d for dirt track cars or have different mounts than I want. I called QA1 tech with my numbers and needs and he recommended the same shock I had been looking at. Getting more travel would mean extending the axle mount down closer to the scrub radius which I don’t think will be necessary for a lowered street strip type build.

I’m going to wait to make top eyelet mounts until I have the shocks in hand but I’m considering making them bolt to the frame to avoid having to remove the bed and efi computer for welding a whole new crossmember.

not going below the scrub line is absolutely important, and i'm glad you thought of that.
however, i'm wondering just how much body rise you really will end up with, because your shock angle now limits the rise when the shocks top out.
how much difference in your spring drop is there when you unbolt the shock, as opposed to when the shock is bolted in place ?

Dunno how the top mount will end up looking but there’s plenty of room under there.