Finned vs smooth brake drum

RustyRatRod said

Let me pose this question. Let's just say for a minute you get industrious. You swap over some early A body disc brakes, master cylinder and proportioning valve. IF an inspection discovers it, what's the worst they'll do? Fine you? One time? If not much, it might be worth it.

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A fine would be just fine :D
..no, it will fail the inspection and the only way to pass is to convert back to drums. A guy I know just did that a few years back, had a nice VW van with historic plates, converted to front discs and then converted back to drums. So no way I'll risk that.