Drive the car onto some 2x4 blocks so that the front is just high enough to roll your jack under the front x member.
Put a block of wood between the jack and X member, and raise the front. Put a pair of high quality jack stands on the front frame on the swaybar mount. This will put them well out of your way, and get the car way up in the air.
Now, you can go in from the driver door back to the x member right in front of the diff. catch it with the jack there and raise it up. Put jack stands on the frame rails in front of the rear tires.
Slide a pair of old wheels/tires under the car so that if it falls, it won't go all the way to the ground.
On the Z bar, there is a nut requiring a 9/16" wrench on the outboard side of the Z bar where it bolts to the frame. After you locate that, take note of how the Z bar hooks to the rods with pins and clips. Pull the clips and pins at the clutch rod coming out of the firewall, and coming off the trans. Now, remove the 9/16" nut and pull the nut and the clip behind it off. You can wiggle the Z rod now and it will come up off the frame, and pull away from the ball stud on the engine.
Pull the dipstick out and dipstick tube.
Remove the spark plugs. (your stock ones are fine, no need to change these to anything different. You may need to get different plug wires with straight, 45 degree, and 90 degree boot combos to keep them off the header tube.
Remove the old exhaust.
Fit the new exhaust in and get ready to swear a whole bunch, and throw things around.
After a few hours, of beating, banging, fitting, etc, you will get them in.
I had to drill out the main bolt holes larger just a tad.
Just remember, the end result will be awesome!