Don, If I remember correctly these heads were first introduced in 1957 on the fuel injected Chevys and that is when they started to become known as "fulie heads"... I have oned numerous sets of these heads, and back when I was in high school I used to buy up as many sets of these I as could get my hands on as long as they were cheap... I still have a couple of sets of these in storage that I have had for many years... Only thing is like the others have already said, by the time you re-build them you have nearly as much invested as what some of the new aftermarket heads cost...

Dave