Make sure you run a tap down the hole where that long bolt goes in, too. I have NEVER found an aftermarket manifold where that bolt hole is threaded deep enough. You can torque all day on that bolt and be doing nothing more than buggering up the last few threads on that bolt, and then it gets dang hard to remove.
Ditto on checking to be sure that rubber donut is in there.
Also, if your exhaust ports are only running 600 degrees, consider your motor running cool.
All intake gaskets are the same: 326, 350, 400, 428 and 455.
