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If you are using their block, then I would use what they recommend. I was assuming that you just had a GM block re-sleeved.
I was also wondering about the coolant jackets. I don't see how the big bore sleeves stay cool. They cut into the coolant jackets in the block. The block and heads normally line up. With bigger sleeves, the coolant passages won't be the same. I'm sure Dart figured out how to make it work on their block though. Do you have any pics of your block?
So I’m going to be using a DART NEXT LS 427 block.
I spoke with DART and they were adamant about using gaskets made for their block only. They said the cooling holes won’t line up otherwise and I’ll have issues if I use LS7 or any other gasket. Weird.
Didn’t make sense if I’m using LS heads. I’m using Trick Flow 245 cc heads.
So the only gasket I can use is a Felpro 0.051 gasket.
I'm using cometic 6 bolt head gaskets on my dart block. No issues at all.
cagc 5703-40
cagc5702-40
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Do you have any pics of your block? 
