Be very careful when buying those manifolds without a reinforcing strut between the exhaust ports- - - -they have a nasty habit of warping from repeated heating and cooling, sufficiently to make it difficult, if not impossible to install some of the bolts. Later versions of the same item had a thick strut inline with the ports to prevent warp. Ask the seller to post a picture with them bolted to a cylinder head before making an offer.
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!