I'm running 31's on my stock 79' too. They don't rub, not yet..I bought a 2" body lift for $89. That is the cheapest route. But like you my front body mounts are toast. I priced 2 new mounts from SSS, at $65 for the set. This is still cheaper if you had to fix the mounts and such than ordering a suspension lift. But if you are looking for a 2.5" lift I hear the Rancho is good. Scout Masters page can tell you about it. Just the other day I ordered the Triangle Lift from SSS for $440 plus shipping. It is the 4" lift that allows 33"s to fit. That would allow plenty of room for 31"s. SSS says no changes in tie rods or steering arms are neccessary, just some brakeline adjustments I hear.
Hope this helps, I'll post how the Triangles work...
As far as buckets go I was in the local yard the other day searching for Scouts and came across several Dodge full-size vans (mid 70's early 80's my guess) that had cool front bucket seats. Lowback with lap seat belts built into the frame. There frames are very similiar to the Scouts, 4 bolt and the bases were about the same height and width. The seats slide forward and backward via a handle between your legs, easy. Some I saw even had arm rest. the only thing was they do not fold forward like Scouts. But It looks like they slide forward enough to get passengers in the back seat. They were very comfy too. I'm going to do some measuring on my Scout and go back to the yard and compare, they look like good prospects..
Keep you posted, Adam B.