273 to 360 exhaust

When I tried to put 360 manifolds on my '69 318 I found that the 360 exhaust ports (at the head) were humungous. Of course I was using the '92 Magnum truck manifolds. There just wasn't enough surface for the 360 manifolds to seal against. Turns out I had to swap my heads for the 302 casting which are a little newer and have more surface to seal on. Look at these pics and you'll see why???
In the pics the 318 gasket is painted blue, the 360 gasket is the long (one piece) gasket. When you overlap them the 318 gasket is almost swallowed by the 360. There's almost no overlap at the bottom and this is the area where 302 casting and newer 360 heads have more flat surface.
Hope this helps??

treblig