Re: 1956 Do I need to notch?
having the upper and lower control arm mounts built into the crossmember makes mounting it and doing something incorrectly, by accident or by simple ignorance, a lot harder to do. at any rake angle you desire the crossmember will retain the correct geometry and dimensions between the upper and lower control arm pivots. simply set the frame at the rake angle desired and level side to side, then do the mods to the frame to allow the cross member to slip in between the rails after boxing that section, tack it in place, assemble the parts in a mock up style and block it at the neutral position so the lower control arm is level side to side, add a wheel and stand back to see if you like how the wheel fits into the fender wheel opening and also the ride height. if it is all like you want then it can be welded in place.
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