THE PROPER WAY TO INSTALL  A FRONT BODY MOUNT 
 I recommend the first thing you do is unbolt the fan shroud and
 lay it back on the fan. The reason for this is when you are
 jacking up the body to remove the original mount the body
 will twist and the shroud  can catch the fan and can break.
  The next step is to remove the headlight and unbolt the inner
 fender from the frame.Remove the bolt in the #2 mount (shelf
 mount) this mount is located behind the drivers seat as you step
 up to the rear seat.  Now you can jack up the body and place a
 4x4 block of wood between the frame and inner fender.
 Proceed to take the remaining body mount out. After removing 
 clean this very well with a sandblaster or a body grinder. Make sure 
 that you clean the tabs on the trans tunnel for welding . Insert the
 new body mount(make sure) that the tabs go in towards the trans
 tunnel , the smooth edge goes toward the inner rocker.
 Now that you have this in place insert your wedge on your inner
 rocker side.  Jack up the body and remove the 4x4 block and let
 the truck down onto the body mounts untill there is enough
 weight to fit snug . Look at your body mounts and make sure
 that they are in place properly and that the wedge is centered.
 If the wedge is properly in place you can then weld the body mount in.
 You can lower the weight down onto the body bushing .
 Use the bushing to line up the place to drill the hole for the
 body mount bolt a few notes
  * After the mount is in place drill holes through the floor and 
  plug weld to the lip of the  new mount
  * Expect to  fit up the mount a few times before welding it in
  place
  * On the drivers side you should remove the E-brake cable
  for the quickest installation.
  * On the pass side the fuel lines and wiring needs to be
  moved for welding.
  * Shims may be neccesary to allign door correctly 
  * Check door hinges for play to help door fit. Open the door
  and lift the door at the back on the bottom , up and down
  and note if there is any play in hinge) 
  * There are several methods for welding the mount in.You
  can drill 1/4 " holes  around the perimeter and plug or 
  weld the mount in. You can also seam weld at the edges as
  well as plug weld the mount to the firewall and the inner rocker.
 * Don't forget to seal any edge with seam sealer. I have had 
  good luck with 3M/s Fast And Firm sealer.It; comes in a
  tube for calking guns and runs about $7 a tube