You could lower the back with different shackles. I did that with mine and that way it sat almost level. The D100's always set nose down in the front.

The front of your truck is definitely lower than stock. Compare it to the stock front on my truck. If you want to raise it with springs , you could install the heavier V8 springs. Not sure how high that would lift it but worth checking into.

But is that v6 or v8? Mine a v6

You have a slant 6 right? No V6's until 1988. So if you put in springs out of a V8 it should liftt he front a little. But I don't know how much. 318 would be one step up. The 360 engine should be a little heavier yet. Do a search and see what others have done. Rock Auto may list the different springs for you.

No I have a slant 6 automatic. Stock front end and springs. Rear is lowered 2 " to sit more level. Air shock for hauling a load. I can measure from the ground to the fender lip for you tomorrow.

If those are original springs they could have been cut or they could just be"shot". They very well could be the same length as original when in the ground out of the truck but fatigued. Or someone could have cut off a coil.
Also there was a recall or at least service bulletin about the driver side sagging, and Mopar actually had a spacer package where you had to pull the driver side spring and put a spacer under it.
If I were you I'd find a set of Moog replacement front springs (either standard or cargo coils style) and be done with it. Once they settle you will have to get it aligned. Front end height DOES affect alignment!!!
The standard coils I think do give slightly more height.
Certainly won't be $378 /pair for those. You don't need anything "custom made".
I replaced the ones on my 83 3/4 ton I used to have probably 15 years ago. Wasn't a bad job at all. Though it wasn't my first front coil spring replacement....

I can measure from the ground to the fender lip for you tomorrow.

From the ground to the fender lip, measured at the center of the wheel. 31 3/4"

Do you know how much 3/4 ton springs would lift the front end of the truck

No I don't. And I am having trouble understanding how your truck is "stock" height? It is obvious from the picture you posted that your fender lip looks much closer to the top of the tire than mine is?? Unless it is trick photography? Must be a downward angle of your picture.