Stock Manifold Flange Gasket

I have 318 exhaust manifolds (Left -3614395, Right 2843953). I am trying to install the Head pipes but the flange gasket (Felpro 60025) that the parts stores sell me do not fit, the hole in the gasket is to big.

The manifolds have what I would call a ball and flange, they are not flat. Does this mean I do not need a gasket? I thought I read somewhere that the ball and flange manifolds are gasketless. And does this mean I would need to use bolts with springs? I read that somewhere too.....

I am confused so I thought I would throw this out to you guys. I plan on changing to 340 manifiolds or headers in the future but it just is not in the budget right now. Any information would be appreciated. THANKS :sad1: