With further information now brought up I will stick my neck out here and suggest with the larger diameter 2.190 valve and its presumed longer stem length, thus the a heaver valvetrain mass, and with a higher rocker arm ratio, if you were to change to the Crower solid flat tappet cam then the use of the 68405 spring as eluded to in the cam card might not be a good fit.
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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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