Thanks for the info guys i am going to grab on to them here is a link to a pontiac site with head id and stuff from 1959 to 1981 thats where i got the info on these heads and it shows in 1974 2 sets of #46 heads one set with the bigger valves 2.11 1.66 89 volume and the other set with smaller valves 1.96 1.66 ...98 volume take a look
http://www.angelfire.com/on/geebjen/heads.html