I never knew that about intakes. Maybe this engine is within limits on the aft tilt. It just "looked" out of kilter. The engine alignment (side to side) issue is fixed. I did just what you said but I had to loosen the passenger side mount to make things right. Everything is bolted up and torqued down now. The last thing is to confirm engine tilt with the digital angle gauge.
see if you can find a newer edelbrock catalog or maybe the info is online. it will explain everything about the manifold dimensions. as an example; a 6pak intake has the back of the rear carb pad about an inch higher than the front of the front carb pad. that's going to figure about 3-4 degrees. something else to do when the car is on the floor put a 3/8" spacer under the back of the injection unit (front of injection unit will sit on the manifold) and then check with a level.
