TTI HEADER INSTALL ADVICE

I bought a pair of long tube TTI headers at Carlisle last year & im finally getting around to put them in. I dont have much experiance with them. My car is a 67 barracuda with a 360 & power steering. What is the best way to install them ? From the bottom, top, do i need to loosen the engine mounts & jack the engine up ? Is there any mods i have to do to the headers ? Also it has a 4spd. Some time ago i installed a pair of Schumacher short headers to a 69 big block barracuda that i owned & i had to do some mods to the left header to clear the Z bar on that one. Is it possible to use the factory exhaust manifold studs or do they all need to be bolts ? Thanks for any help.
Their website has pretty explicit instructions for different applications which begin with "make sure that your engine is sitting properly where it belongs between the fenders. They even give dimensions.