318-3 Closed Chamber Truck Heads

After all this discussion, I'm now not sure whether I am going to use them, not because I think there will be issues, but because my combo has changed a bit. My engine was a good running 318 which I was going to freshen up, but upon pulling it down it needs everything, so it's at the machine shop getting zero-decked to KB167s, balanced with a Comp XE268.

I'm in dilemma on whether to use these or just buy the eddies to make the most of the new bottom end.

Not sure which way to go yet, gotta pay for the bottom end first!
Open to suggestions!

Pete