check out
http://67-72chevytrucks.com/vboard/s....php3?t=130318 and
http://67-72chevytrucks.com/vboard/s...d.php3?t=60649 To me doing the crossemember drop is easier. I just got done chopping it 1.5" which should let me lay frame along w/ a couple of other mods. If you Z the frame, deppending on how much you might have to move the motor forward to avoid firewall interference, new trans crossmember, and redo the trans hump. To Z the frame is a lot more work than just doing the crossmember. How good are your fab skills? Other things are is your truck a auto or stick? Talking to Fastbagged68 helped me make the decision on weather to Z the frame or just do the crossmember