"Like all other aspects of engine building, port size is relative to the required airflow of the engine. The smallest port that will deliver the airflow needed by the engine is desirable. That means we will have excellent velocity for port filling, but without any choke that may limit required peak airflow. The needed airflow depends on engine displacement, RPM, and VE at that RPM. And a port big enough to deliver 400 cfm may well be too large for any engine that can only use 300 cfm."
Jim Hand
https://www.youtube.com/watch?v=CmfxHNxk8ew
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE