installing 340 in 69 dart with exhaust manifolds bolted on

Thanks for the info. I did use the Black RTV on the corner studs, so I hope they don't leak. When I got the car 25 years ago it had 318 manifolds on it, so that is why all the HP manifold stuff is new to me. I did look at the Remfex gaskets after I bought some NOS Mr. Gasket gaskets from the 80's hoping the asbestos would seal better. Now I am beginning to think that was foolish.

As far as torque goes. I never really got a solid answer on that. Some sites say 30, others 20. I went 25 on the right side, but that seemed too much.