Impressive Mike.
I itend to take a similar path if I convince myself of the Cobra's fit for my needs. I was researching your chosen cam and I found this out which might be relevant to yourself:
If you whack in some ported heads with bigger valves, clearance to the pistons will be a problem on this cam. Apparently the airflow research heads are the only ones that wont require cutting the pistons.
http://airflowresearch.com/articles/article48/A-P1.htm
Have you seen my email/pm?