When I was a Chrysler tech we (I worked with the powertrain guy) 'rebuilt' a 4.6 Mustang engine for a used car the dealership was selling. We definitely did not degree anything.
All those multi-chain engines can be complicated. It usually takes two sets of hands to hold one part and get the other pieces into position.
Sprinter engines were the worst. They have these plastic guides that were hard to get to behind the cover, then like all the other OHC engines you feed the chains through these openings while holding the crank sprocket and getting them around the cams... lot's of manly cursing and such... ahhh the good old days of 2012.