Flat tops in a 355 should make just over 10:1 like you said. Freeway gears, 9:1 compression, and 76cc heads is a whole different animal than 3.73s and 64cc aluminum heads and each would require its own cam selection.
With the 64cc aluminum heads and the 3.73 gear I'd look at a cam with a hair more duration, like the Comp XE268 or similar -- 268/280* advertised, 224/230 duration @ .050, .477/.480" lift, 110* LSA, 106* ICL.
With the 9:1 compression and freeway gears even the cam PDQ suggested might be a little on the big side . . . something about 15-20* shorter than the XE268 I mentioned above would be a good starting spot. (that's about 250* advertised duration and about 210* @ .050)
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle