There's a possibility of an interference problem between the steering column and the driver's side exhaust manifold if you use the rams' horn style of manifold. If you use a manifold from a 1955-57 passenger car on the driver's side the outlet is far enough forward to clear the steering gear. Don't get conned into using headers instead of manifolds- - - -there's virtually no difference in exhaust flow until the RPM gets far above anything that's appropriate for street use. I had years' worth of dyno test results to support that claim until an over-zealous assistant principal at the high school where I was teaching auto mechanics had the brilliant idea to discard a file cabinet full of "obsolete" paperwork and a bookshelf full of service manuals from the 1950's and 60's! He dropped off my "favorites" list in a hurry!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!