GM 3.4 Cylinder heads

Are these 3400 style heads, or 3.4L? If they aren't any good, I have a set of 3400 heads laying around. I've been trying to get rid of.
 
That would be the 3400. I have a ton of extra parts for that engine. Whats wrong with it?
 
You can use 2000+ 3100 heads, they like to crack especially the rear mounted head. use GM headgaskets not failpoop (felpro) .
 
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