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That's the camshaft I'm looking at. Were did you find the ivc? I did another dcr and came up with 7.42:1 is that good for the cam I'm looking at? Why doesn't Howard's cam list this information? Is there a simple formula to figure inv?
So your advertised duration of the intake lobe is 255*, intake centrline is 106*.
So split the duration and it will give you 127.5*. So the advertised intake opening and closing will be 127.5* either side of the installed centreline.
Intake closing will be 106 + 127.5 = 233.5* after TDC or 53.5* ABDC. (Round up to 54*)
