Bell crank bushings

I know the center point needs to be delron(spelling?) but i was thinking. If i have the leverage points on top of the axle, can i use nylon bushings on the dog bones instead of heims? i would really like to avoid those as much as possible. Ive used them below the axle many times with zero problems but being above you think will start to be issues?

The pivot point doesn't NEED to be delrin, but it should be a non compliant bushing of some sort. The dog-bone needs to be able to pivot around because the rearend will not stay parallel to the bell-cranks. If you don't allow for that you will end up breaking things.

yeah i was aware of the twisting factor. just trying to figure out my options is all. Ill probably just go with heims and make this simplified