Yes, start there, then see how the bolt holes line up between the I.M. and the heads and how much gap there is between the front and rear bottoms of the I.M.. You might need to use different I.M. gaskets or determine if there needs to be some milling done to the heads or even the I.M. surface. You might just need to enlarge the I.M. mounting holes. This can be determined by doing dry mounting the I.M. several times to observe the alignments and measuring the gaps at the front and rear, then enlarging the holes that don't align. When you get the I.M. mounting holes aligned, you can check the I.M. gasket alignment with the intake ports on the I.M. and heads. Be patient and take the time to get it mounted right.
