I've always used Permatex Ultra Black on pretty much anything but head gaskets. The key is using a thin coat and letting it tack before fully torquing the bolts.
It comes off very easy if you use a straight edge razor blade.
I like using gasket sealer because it fills in the imperfections in the block and whatever part you are sealing. A gasket alone may not, especially if you are working with an old block that has been rebuild over and over, rusted and cleaned, etc.
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