I did one years ago, dyno tested in Feb 1998....
1970 RA III 400 with 4 bolt mains.
455 crankshaft; machined for the block.
Our flow bench was a bit generous. I sold the heads to Paul Knippen and on his bench they were were 278-282 at .600" lift.
https://pontiacstreetperformance.com/psp/racerSC.html
P.S. ..... The Fulper info I posted above does not represent any endorsement. And unless specified it is not based on personal experience and is offered for general interest only
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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