"I'd have the tires mounted and balanced professionally and have someone do the alignment when you're done - other than that, it's good newbie stuff. A Haynes manual wouldn't hurt to have lying around if you don't already"
not a bad idea at all...but you will def. have to spend more then $400 on the suspension, especially if you want good performance out of it
after you're done with that, i would def. do airwork next
