11:1 static CR should be no problem with aluminum heads and a cam that big on pump gas. Dynamic CR is the important number.
My 428 is 11.4:1 SCR with 72cc E heads and solid roller of 248/254 @ .050, 114 LSA and runs fine on 91 octane. Just keep the quench as tight as you dare to go. Forgot exactly what mine is. I've found that has a big influence on octane appetite.
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