Stated... "Seemed to pull to 4800 to 5200 and fall off sharply. Could have been the stock springs but didn`t hear anything bad going on."
Might of been nose diving due to inadequate pressure to control the valvetrain mass.
"The valvetrain is one of the areas where properly matched parts are vital to ensure that the engine functions properly and the valve springs are the key to this."
Valve springs often loose pressure over time.
To the OP. If the springs are old. Replace them.
Not a place to cheap out !
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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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