dougs headers dont clear my z-bar clutch linkage

Yes, you must modify the Z Bar to clear the header tubes. As I recall you need to bend the lower leg of the bar in to the passenger side in the form of a "dog leg" "jitty jog" "Z bend" or whatever you want to call it. I cut mine off and made a new one.

Mini starter helps too.

Also, my Doug's hit two ears at the 3 and 9 o'clock position on the bell housing so watch for that.