These would apply to 73-87's for sure, some may apply to 67-72's...
-glass hood
-glass fenders
-glass bumpers or roll pans
-each bumper has 4 brackets, use only the outer two
-remove heater/AC stuff
-remove inner fenderwells
-switch from PW/PL doors to manual operation
-one piece rear glass as opposed to slider setup
-bench seat as opposed to buckets and console (or single racing seat)
-aluminum wheels
-aluminum engine components
-plastic fuel cell as opposed to steel gas tank
-remove radio and components
-remove tailgate
-remove all junk in bed and cab
-when racing, run 1/4 tank of gas as opposed to full tank
-remove spare and jack assembly
-go on a diet

-wear shorts not pants (less material)
-shave your head (less hair = less weight)