Find a Nova or Camaro with a lug bolt pattern that matches your rear axle, and graft the entire front frame from about the firewall forward to your stovebolt frame. That way, you can take advantage of the millions of dollars' worth of engineering that made the suspension, steering, and brakes work on the original vehicle, not some shade tree hotrodder's idea of what works when a sub-compact car crossmember gets grafted into place.
Jerry