Thanks to Norwood and his expertise (no doubt using surplus, Area 51 Alien replication technology), he has come out with another unique part for our cars. This time it's the heat riser shroud mounting bracket for the 72 455HO engines.
Here's is the problem. The only repro available for the 72's is the wrong style bracket that is used on the 70s and 71s. Pictured on the top and bottom, it has two big "ears" that come up to protect the vacuum hoses. This was not used in 72.
Here is a borrowed shot of an original 72 bracket on top, and Norwood's exact duplicate on the bottom:
And a borrowed photo of the 72-only shroud unit that employed a locater tab to engage in the slot in the bracket:
Compared with the repro piece that is sold by all the venders and mistakenly described as fitting all the 70/71/72 cars. The triangular piece needs to be trimmed down into a small tab, and then it works just fine with Norwood's bracket:
And the modified shroud and new bracket, assembled and mounted. (...and it looks like I need to do some detailing and repainting over the winter).