Take the gasket off one side. Put intake back on and snug the bolts on the side with the gasket still made. Look to see if the intake lifts up when you tighten the bolts. If everything looks good slide a feeler gauge in and see how much gasket thickness you have on the gasketless side. Your intake may be milled too much or have the wrong angles milled into it.

How much crankcase pressure you have?

Leon