Automatic or stick ?
If automatic here is a interesting article with a formula......
https://www.circledspecialties.com/b...g-applications
Also noted there are numerous online calculators available that allow you to simply fill in the data fields for these parameters & then will give you the mathematically ideal final drive ratio as a result.
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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