Here I ALWAYS back up the ICL checking by also turning the engine is the same direction and taking a look at the intake open point @ .050". The cam card will also tell you when the intake opens in crankshaft degrees.
So if the cam card (for example) says that the ICL should be 109 and that the intake opens @ .050" at 8 degrees BTDC then it should be very close to that number if you have the ICL in the correct place.
I actually prefer to to use the intake open point vs ICL since a LOT less movement of the dial indicator is required. With the ICL method you are going clear up to full lift and recording numbers on both sides of the lobe. It sounds easy when folks talk about it but it can be a real PITA to get your dial indicator set up so it has the correct geometry to record the lobe movements without any errors from slipping or moving on the magnetic base, etc......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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