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I believe the article you're talking about was 'Choosing an engine for a G-body'. I had a hand in developing the article from a stub, but I had not proofread it (nor did anyone else) so it shouldn't have been given a category (this makes the article accessible).
Articles that are undeveloped are supposed to be put into the Undeveloped articles area only, not into the general categories like Engine or General hotrodding. I'm unsure how it got a category assigned. My best guess is it had already been given a category and I didn't remove it.
In any event, I take responsibility for it. It has been revised, but still needs work so feel free to add/subtract/change as you see fit.