Mark

I have those, would really like long tube headers 

Can't find long tube headers for my catalina, anyone know of what might fit, I have oval ports.  I might just try a firebird set, see how it goes. 

I have fire bird ram air exhaust manifolds due to the oval port edelbrock heads.  They have 3" outlets. The muffler shop just put a flare on the exhaust pipes with no gasket.  I expected something like a flange gasket.  Of course I eventually had leakage, ground the manifold outlet for a tighter fit.  

Recent modification to the car and putting a new exhaust on it.  Any suggestions for sealing these tighter?

I see this is an older topic.  You get it in the car and dynoed yet?  My 455/462 has a quick fuel carb, 750CFM, MSD, 477HP, 550TQ at the crank. MSD ignition.