thinest head gasket?
#2
Cometic makes them as thin as 0.028", however, you need to be mindful that you should have a minumum of 0.035"-0.045" clearance between your piston and head to account for conencting rod stretch at high rpm!
#3
I would worry more on which is the best gasket. I use stock GM head gaskets. The cometics seem to leak and need to be retorqued down. I know you have a big bore so see what works the best. I would rather have an engine that is sealed verses trying to get a little more CR out of it.