OK.. let's clarify. You said there was a lot of smoke in the engine bay, right? HG's almost would never blow smoke outwardly like that. Sounds like it runs. Get us a vid of it running for say 20-30 seconds. In the vid, hit the throttle quick once or twice to say bring the rpm from idle to 1500-2000 just a quick hit and release. Then add a few pics of the overall engine. Each side and that coolant leak you see.

You'd be impressed with how much we can tell you from that little vid.