Hi everyone. Since I bought my 348 several years ago and turned it into a 434, I've been meaning to look at the heads that came with it. The motor is suppose to be from a '61 Impala. Finally, today I took a peek. I saw that the heads were manufactured in 1960 and the last 3 numbers are "379". From what I recall reading in some previous threads, these aren't so great, are they?? Not sure what I am going to do with them. Thanks, Carmine.