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Here's the flat tappet cam GM used in smog era L69 "H.O." 305 Camaros: 202/206, .403/.415, 114.5

The heads were also somewhat performance oriented, and compression ratio may have been more.

Good info here: L69 cam specs ? - Third Generation F-Body Message Boards

 

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Only 202/206 @.050 ?
That seems pretty tame even for a 305.....?

Then how about this for the standard grocery getter 305 LG4 cam?

178* dur @.050 intake
194* dur @.050 exhaust
109* LSA