Magnum heads and 340 manifolds

Hey Adam, I have a 340 with the EQ magnum heads. The 340 hipo manifolds bolt on just fine but they do not seal on the bottom of the head port. They leave a gap of about a quater inch.
I made some 16 gauge plates to fill the gap and I don't know if it will work yet as the engine is still on the stand.
I'm wondering if anybody else ran into this too and what they did to fix it.