The exhaust/steering gear clearance fix a lot of engine swappers recommend is to use a left exhaust manifold for a 265 engine with the outlet up front. Anything would be better than headers unless you have some stock in a gasket company and/or a lifetime supply of free spark plug wires.
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!