Hemi Swap standard AC
You won’t have any problems with your fire wall. You will have to make custom hoses. You can rent a hose crimper from Autozone and buy all your fittings. If you can get the factory lines from the original donor compressor that may be helpful. As far as you electrical, what harness are you using. I used Hotwire and there is a connection for the compressor. I used a Dakota digital fan controller works great. Use the compressor with the Hemi. If in doubt go to a local A/C shop and ask them. They usually don’t mind giving out free advice. They can also make your lines for you if you want solid lines instead of hoses. I have hoses which I’d don’t really care for, they look messy.