I just checked Ebay- - - -there are numerous examples of the rear dump exhaust manifolds for 305 and 350 engines, including the ones that put the manifold runners below the spark plugs. Those accomplish the same results as "block hugger" headers, at a fraction of the cost and installation hassles.
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!