The article lists part numbers for the individual parts but that won't help ID the engine if you're just standing there looking at it in the car. The main visual things are exhaust manifolds - the 425A Trophy engines had cast iron headers instead of the regular log manifolds used on the regular engines. The generator pulley is also larger. Mainly you have to look at the engine code on the front of the block. Here are the 1961 codes:
333hp four barrel engine codes were
F4, F6, F8, FD, FE, FO with manual transmission
FO with automatic transmission (Ventura and Catalina)
U9 with automatic transmission (Star Chief and Bonneville)
348hp tripower engine codes were
M4, M6, M8, RM4, RM6, RM8, MD, ME, RMD, RME with manual transmission
MO, RMO, V9, RV9 with automatic transmission
I think the codes starting with an 'M' indicated if the engine was for a Catalina or Ventura, and the 'R' indicated if the engine was for a Star Chief or Bonneville, but I can't confirm that.
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