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The LS1 is not a smaller engine. its identical in size to a standard 350. 346 isn't visibly smaller than a 350, 305, 327, etc. the motor mounts are in a slightly different location but thats about it. the LT1 engine's intake manifold was shorter than the LS1/6 intake manifolds. The nose of the LT1 cars were sloped down in the front considerably. between the taller manifolds and the air box assembly the noses of the f-bodies needed to be rasied. The air boxes in the 93-97 f-bodies were actually in the engine bay. the 98-02's were in front of the engine bay. There are considerable differences in the locations of the accessories, the alternator is on the bottom of the engine bay opposed to the top. The redesign was strictly for the change of engine. You can probably find a front clip off an LS1 bird at a junk yard or on one of the message boards cheaper than from gm direct. There are kits out there to do the swap. also remember the LT1 cars have opti sparks and the LS1's have one coil per cylinder. The coils also sit atop of the valve covers making the engine taller. adding the fuel rails over the top of the engine also added height. the fenders are the same but the hoods are more raised in the center to accomodate the changes. the LT1 cars have indented hoods. just keep in mind those things when doing the swap. gl.
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