71 c30 project

[rwade]

Does it look like if you elongate the perches will there still be enough room in the trailing arm for the wider U-bolts? Or will that be the next hurdle?! I appreciated all the info. I've got a 72 3/4 ton trailing arm frame that has 88 cross member under the front and the same rear end for the rear. They have it temporarily mocked up with bolts from the bottom and nuts on the captain fab perches, and I'd like u-bolts to be 100% confident in not loosing my rear end going down the road (lol).

Wade