[bobinbc]

the horse looks like it's already out of the barn, (looks like you already removed the clip from the donor)

Basically:
what I do is measure from the clip to the ground at a point near the rear of the clip and at the front of it with the donor sitting at ride height BEFORE you remove the clip. Set your truck on blocks at the desired final ride height, cut the front of the frame off(after many careful measurements), roll the clip into place and compress the springs with threaded rod thru the shock holes until the ride height of the clip matches the measurements you took at the beginning. trim & weld