Denny, reversing the bracket did the trick, now the pulleys are properly aligned.

Thanks Fred, the engine is looking good!

I cleaned every part on a wire wheel (except the fan which I sandblasted, and the manifold which I left alone). Everything then got a coat of "rust-stop", which I imagine is some kind of mixture of acid, oil, and stickum.

I briefly considered painting the parts, but this would've been a pain in the butt. Painting is time consuming, messy, and tricky to get right, and paint scratches.

I thought about doing nothing, just bolting the parts on rusty. But that wouldn't "feel right", and the engine would be ugly.

I think the bare metal with rust protection looks good, and it should stay looking good, and it was quick and easy. Once it starts running the engine will get covered with oil and grime, I suppose. But I can just roll into a car wash and clean it up, no problem.