56dunemobile

I have a 56 block (V1,253,xxx) but with 55 #8 Heads. The Intake Manifold is marked 567481 with a 4 barrel carb and a 56 valley cover with no interference noted.
Is this an issue since I haven't started it since rebuild? I bought it this way. I read that you can't install a 56 intake with 55 heads.