On a BBC not all of the intake bolts go all the way through into the valley like on a SBC. They are also angled differently -- I have not seen intake bolts leak on a BBC personally (that doesn't mean it can't happen though.)
I'd put sealant on the ones that go all the way through to be safe and leave it off the ones that are blind tapped.
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