The timing chain and oil leak have nothing to do w/ 4x4, straight forward to fix, search for links to writeups on the net and have at it.

The bucking ride problem seems pretty straight forward to fix, sounded like you decided the shocks were too short, so either pull the blocks and crank down the torsion bars up front or get proper length shocks. Again, really not 4x4 related, most all trucks will have 4 wheels and 4 shocks. And with the torsion bars cranked down, you'll probably find it easier to properly align the front tires. If yours is cranked up as high as it sounds, no wonder the wheels lean in and the ride is like a buckboard wagon. Dropping it back down to it's stock ride height will cost very little (maybe only the cost of an alignment that you need to do anyway).