It's not that hard if you have the exhaust manifold installed in the car and the car on a lift. Then it's easy to piece it together and make sure it clears all the other things around the engine on the driver's side before the final "bolt in". You tack everything in place then take it out and finish weld. I had to develop a universal down pipe that could be installed on any A body, it worked out well and I sold many, many of them.
