Looking at my notes from years ago, this is how I did it. I only mounted the block so the headers were not on yet. I took measurements from a completed A&C that a friend had.
Passenger side:
Upper x member to 1st exhaust header bolt CENTER 15 3/4"
Height Measurement:
Lower x member - Top of bottom of x member to center of water pump pulley 9 1/2"
![](http://www.priveye.com/cobra/Mount4.jpg)