Well this may not be addressing the question or flat out wrong way to approach this, but you can try this link:
http://yojimg.net/bike/web_tools/stem.php
Enter the head angle of the Jamis with current stem angle and length. Do the same with the Surly keeping in mind the difference in effective top tube length. Thus you will take into consideration the head tube angle. Also, do you know the stem angle? Keeping in mind head tube angle, stem angle and length should help you mimic the Jamis position. Again, I don't really know what I am talking about and I am sure smarter and more experience folks will chime in.