Overall the panel looks pretty good. Looks like it has some of the usual issues for that age truck.

They put in a Ford front clip and still put in a gm engine and transmission??? Why, why??? The 78 LTD II was the fullsize car. Basically same as the 70's T-birds. No 6 cylinders came in them. The smallest engine available was the 302 SBF V8. But most came with a 351M/400. The front springs are probably just worn out. Just swap in some new heavier/stiffer springs and you should be set.