Butler uses Comp XE hydraulic roller lobes. In the linked cam here the only similarity to Dave Bisschop's Old Faithful cam is the same 236 degrees intake duration and the same 112 LSA.
https://butlerperformance.com/i-2503...tegory:1272239
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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