Early A V8 swap advice

As to the engine mounting
I used the 1965 273 engine brackets and isolators, to mount a 340 in a 65 V100. I had to add a triangular piece to one of them, to catch one mounting ear on the engine. I do not recall which side, maybe the drivers side. But you will want to chain the engine down anyway cuz it doesn't take much power to tear the isolator.