Jay would also set the 60919 up with 120 lb seat pressure, lower 300s spring rate. With a note that at a very high peak rpm level there could be the potential of some valve float. I highly suspect at a rpm higher than anticipated here, that and it would depend on the valvetrain mass involved.
And as noted a valve spring will lose pressure with run in and use.
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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
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