Oil be darn

You can remove the intake & gaskets, lay 8 pieces of 3 inch long, small diameter solder vertically next to the ports and snug the intake back down. The solder will smash down and reveal what the relationship is between the angle on the heads and the angle on the intake. Remove the solder before reassembly.

Worse case, you may have to have the manifold cut to improve and match the angle of the heads, or re-ring the bottom end and have the heads looked over carefully.