Will this work with my existing A/C compressor, or do I need a specific model?

This bracket set is designed around SBC short-pump geometry. Your compressor should bolt directly to the provided mounts as long as you're running a compatible short-pump setup — verify your water pump style before ordering.

Do I need to drill new holes in my engine block or use the factory bolt locations?

These brackets use factory-style mounting points on SBC blocks, so you're working with existing hole patterns. No drilling required for a standard installation.

Can I polish this further, or should I leave the finish as-is?

The polished aluminum is ready to install and show. You can touch it up with aluminum polish down the line if it dulls, but there's no prep or coating needed before bolting it on.