Tips on installation? Before ya do anything park on a level surface and take measurements at all four fender wells.After iI did the bushings on mine the body was slightly higher on one side so I had to play with shims.Nice to knw what it is before the mount replacement.
I jacked it up on the rocker panels using a wood block and a single floor jack,very sturdy compared to the thin floor.Do be carefull and a few blocks off wood shoved between the body and frame is good safety.Loosen all bolts,but do one side at the time.All body bolts but the very front have blind nuts.So if they are rusty or won't loosen,don't get too porky and break something.So before you buy mounts get under with a 15mm socket and see if you can loosen the bolts.
One you replace the bushings on one side,lower the body and check to see it's resting evenly on all bushings.I had trouble with the bushing under the center of the door,had to shave the rubber a little bit.
The El Camino might be different than a car.A mount up front of the front tire,one just behind the front tire,one in the middle of the rocker panel,another mount just in front of the rear tire,one over the rear tire with no bolt and two behind the rear tire. The very rear part of the frame is flexy,didn't look right,but tightening the bolts jacked the frame up properly.