You won't need Riviera parts so much as you will need GS455 parts. However, I would definitely keep the Riviera transmission and all of its associated linkage, as it should have a TH400.
Anyway, the major GS455 parts you will need are the engine mounts, engine mount brackets, and exhaust manifolds. You will need to have an exhaust system made, and possibly a driveshaft, as the Riviera TH400 is longer than the one which would have come with a GS455 (I think). Keep the Skylark transmission crossmember and move it to the rear set of holes on the frame rails. The 455 radiator is different, but I would say try the 350 radiator first, just to see if you have a heating problem. Also, If the Riviera has a rear sump pan, try it first before looking for another one.
Ray
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