[cleatus12r]

Without going completely custom, no, you won't find anything higher than 6".

Here is what I have learned after dealing with '73-'79 Ford trucks for many years.

The coil spring bucket on the earlier trucks is different and requires a different "twist" at the top to retain the coil. This may be the reason they offer an 8" kit for the later trucks.

The easiest way to get more lift out of the F-150 trucks than the 6" coils is to remove the coil buckets and have 2-3" cut out of them. It requires a bit of fabrication work, but it is safe and not too labor intensive. The only downside to this is that the 1/2 ton trucks had married transfer cases (the transfer case is mounted to the transmission) and the front driveshaft angle becomes ridiculously extreme in a hurry.

I was involved with a build a few years ago (I came up with the idea and bolted the parts together) where the guy bought a set of 6" coils and two sets of radius arm drop brackets. See where this is going? The radius arm brackets stacked on top of each other and I had him cut down his coil buckets almost 4" (more than I would do nowadays). With that, we had 8" of drop on the radius arm brackets and almost 10 inches of advertised lift. Obviously, there were additional brackets used to support the radius arm brackets..... It drove pretty good. The track bar was dropped a bit and lengthened. He never did fix the draglink angle though....

You will have to get creative, and I strongly suggest resisting the urge to to a body lift. They make for a lot of headaches.