I have a 250 Block and I am looking for a non-intagraded head for it 1974 or older. I am going to do a home build with used parts too make myself a better than stock I6 for my 81 c10. I was wondering what size used factory head I should use for my build, one that would give me good performace? and If someone has a head that they are just giving away or selling please let me know my email address is kyledyanawetherby@yahoo.com and I live in Western, MA. I have been looking for little while now and haven't had any luck finding a used head for my build so any help would be appericated. Thanks