"An important factor when selecting valve springs, is choosing the correct seat pressure, open pressure, and spring rate for the camshaft being used."
And watch your distance to coil bind.
https://www.motortrend.com/how-to/ho...valve-springs/
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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)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE