Oh THOSE braces! Were those only found on 78 and later cars? Are they WS6-specific? I don't have my '77 here yet, so I can't confirm whether or not they're already present. Seems like they'd provide some decent reinforcement without changing the appearance noticeably.
The deep-dish 15x8 snowflakes definitely look better than the flush ones, and I'll likely consider switching to those when I'm due for new tires and switch to 255/60-15 rather than the current 225/70-15s. You're right that those are some of the nicest wheels made by GM at the time.
Wasn't sure if the '77 block was an XX or not, my old '78 had an XX block, and I vaguely remember that it was one of the changes from the '77 model. But that block wasn't the reason why 220hp was achieved. I can easily bump up the engine in the '77 to 250+hp with super minor changes that are completely invisible.
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