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I recommend Cometic head gaskets. Also, now that you have boost on it I think I'd set the cam back where you had it prior to advancing it. All that pressure down low is going to be tough on things.
Dangit, now you're making me want to order up some dished pistons for my 408 since it isn't balanced yet and put a couple hair driers on it.


I've already decided to put the cam back in at straight up. It had a powerband of a cummins, even so with the stock cam and springs it's all done well before 4800rpm. I'm also going to put a lighter spring in the wastegate, it came with 3 different springs and I think the heaviest one is installed now. Dave