Intake manifold won't seal - How do I check it ?

Earlier I noticed you said your machinist said you needed .100 thick gaskets and you didn't know where to find them. If you do end up needing thicker than normal gaskets Cometic will make a set for you for nearly the same price as a normal gasket. Last time I talked to them they told me they made them in .017" increments so you could get some made that are .102" thick. Last time I bought some from them ( 2 yrs. ago) they cost about $30 shipped