Ok so I bought an 85 f150 from my father a couple months ago,and I'm rebuilding it. It's been sitting 12 years after he bought it. He never got around to doing anything to it.. except put the front body lift on... now I'm having issues with the front driveshaft. . It's to short. So my question is can i get u-joint spacers or have to get one customized.. the driveshaft doesn't have splines.. wil, post pictures once I figure out how..

 

Also has a 351 modified, believe to be original,because the paint matches both the body and engine. .

 

I think an 85 would be a Windsor if it's a 351 but I haven't seen your truck so I couldn't be sure what you've got there.
As far as the driveshaft goes you're best to have it re-tubed with a longer tube.