Hey guys new to the forum and had a quick question. I'm 20 years old and always loved flatheads and I was able to score one for free from my grandfather!! And my plan is to tear down soon to start rebuild. Anyway i took the heads off to see what year block I had which is 46-48, and saw canada on heads and turned them over and saw weiand and 400 stamped on the backof them. Sorry for the life story just wanted to tell you guys everything and just wanted info on these heads and the rareness of them? And if I should keep them or get aftermarkets which was my plan. And any tips on the build! Thanks guys