The Summit line of camshafts, as good as they are, are NOT the same/comparable as/to the Pontiac OEM grinds.
Summit cams got less LSA, more lift, less overlap and less time on the lobes.
And for the McKellar #10, they have even more squared lobes than the #744, with the RAII/IV duration at .405" lift and 1.5 rockers.
http://www.wallaceracing.com/camcode1.htm
http://www.pontiacpower.org/PontiacCams.htm
http://www.classicalpontiac.com/restoration/cams.html