The blower and manifold won't go onto a NA engine, the heads are different.

97s and early 98 models did have different alternator brackets, as well as the tensioner/heater hose setup that sits under the alternator. Also other types of cars will have different accessory setups. Regals differ from GP's and Bonnevilles, etc.

For the most part, the engines are the same on the L67 side except for some differences in heads.