Here is a conversation on a MOPAR board regarding the use of a single pattern cam with the High-Torque .440" lobe number 4213 with 308 at .020".
Note the valve springs mentioned. 275 - 325 lbs seat pressure from some. I would highly suggest you take a measurement of the actual installed height on your cylinder heads.
However keep in mind this is involving a MOPAR valve spring mass, I have no clue how that might correlate to a Pontiac.
https://board.moparts.org/ubbthreads...-pressure.html
Another interesting related conversation, but due note this involves a BB Chevy valvetrain mass !
https://www.speed-talk.com/forum/viewtopic.php?t=16847
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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