It's for the low rider look unless the previous owner was really short and wanted to lower the seat for easier entry (pcspeak
midget,
short person, nope, little people)
You just need to get the correct U-Bolts, chuck the blocks and I doubt anything was done to alter the driveshaft angle. Usually you only worry about the pinion angle is when you raise up on a truck and the axle is mounted under the springs. Some blocks have a compensating angle to tilt the pinion up, but on very large lifts you have to do serious work to the driveshaft to keep it from eating u-joints so they go with straight blocks.
I sure you will have to crank up the torsion bars too.
BTW Nice acquisition! Is the paint & shine as delivered or have you sent it to the buff-shop already?