[PGSigns]

Set the frame on blocks at ride height with rear tires you plan to run on the rear end. Set the engine and trans in the truck and check the angle of the engine. If you are using mounts designed for a stock height truck the engine angle will be down in the back more than the ideal angle. The 3 degrees that a lot of engines are set at is so they point to the rear suspension in about a straight line. With the rear end a foot or so higher than it started life the rear of the trans needs to come up. Get it to the point where it is pointing at the rear end and take a look at the working angles. The you can adjust it up or down and your pinion angle to get about a degree of working angle in the ujoints. Once you have a good relationship between the engine and the rear end you can set the mounts front and rear. Any good drive shaft shop can build you what you need for the two piece to fit your final setup.
Jimmy