Asked in post number 8 but it's still not clear. I presume the testing was performed on a engine dyno and not a chassis dyno.
A water brake engine dyno like a SuperFlow needs to be set to operate in a certain rpm range based off the torque the engine is producing. After some initial pulls and adjustments to the brake, you start testing at a certain rpm. More often than not at about 3000 rpm and up.
"Starting engine dynamometer pulls at low rpm is hard on the dyno and hard on the engine. Today, engine dynamometer testing is an integral part of many HOT ROD engine buildups and product tests. Typically these tests start no lower than 2,800 rpm, and often higher."
https://www.hotrod.com/articles/dyno...often%20higher.
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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