340 manifolds and Magnum heads

I used Hughes Engines new "Iron Ram" Magnum castings along with a set of 1970 340 HP manifolds. They must be beefier in that area because there was no gap like the pictures that Bobscuda67 posted. I used a set of stock gaskets. But I also had to grind a bit off the head where the manifold tucks up tight. Hughes claimes better flow numbers than factory heads and more meat for porting reducing the chance of heat cracking around the seats. Its been running now for about 6 months and there have been no problems so far. I thought the cost was reasonable.