How thick of a head gasket should I run with a stock bottom end, l92 heads that are unmilled, and a Englandgreen Mayhem 2 cam?

I head Cometic has some of the best--these are what I seen on their website. Or can I just run a stock head gasket?

Head Gaskets
Description - (Click Hyperlink to view Gasket Image) Bore Material Stock Code Pkg Qty Price Add To Cart
LS1/LS6 5.7L & LS2 6.0L 3.910 MLS / C.O.T. - .051" C5475-051 1 $90.47
LS1/LS6 5.7L & LS2 6.0L 4.060 MLS / C.O.T. - .051" C5751-051 1 $90.47
LS1/LS6 5.7L & LS2 6.0L 4.130 MLS / C.O.T. - .051" C5317-051 1 $90.47
LS1/LS6 5.7L & LS2 6.0L 4.160 MLS / C.O.T. - .051" C5318-051 1 $90.47
LS1/LS6 5.7L & LS2 6.0L 4.190 MLS / C.O.T. - .051" C5319-051 1 $90.47
LS1 Darton M.I.D. Sleeve 3.910 MLS / C.O.T. - .040" C5788-040 1 $99.20
LS1 Darton M.I.D. Sleeve 4.125 MLS / C.O.T. - .040" C5789-040 1 $99.20
LS1 Darton M.I.D. Sleeve 4.165 MLS / C.O.T. - .040" C5790-040 1 $99.20
LS7 7.0L 06-UP 4.150 MLS / C.O.T. - .051" C5889-051 1 $99.20
LSX - Right Side 4.125 MLS / C.O.T. - .051" C5933-051 1 $90.47
LSX - Right Side 4.185 MLS / C.O.T. - .051" C5935-051 1 $90.47
LSX - Left Side 4.125 MLS / C.O.T. - .051" C5934-051 1 $90.47
LSX - Left Side 4.185 MLS / C.O.T. - .051" C5936-051 1 $90.47


Also, how do you check clearances?