I installed the engine in my 67 500 with the hookers and four-speed on it. The valve covers, coil, and accessories were off the engine. I had it in, on the mounts and bolted down in 28 minutes.
The extreme angle required was impossible with the hoist available at Harbor Freight. I rented one that would fit under the car between the tires.
I used two carburetor plates being I was concerned with that much weight on one flange.
I used moving blankets over the shock towers and over the core support and put the rear of the car about two feet in the air on jack stands and dropped the idler arm off of the frame .
I didn't believe you could install it with headers until I saw his pictures of the installation. It can be done!