I am working on building an adapter plate to fit an Atlas DOHC cylinder head to a 261 Chevy block. The original camshaft and timing gears will stay in place to drive the distributor and the oil pump, while the cams are driven by a toothed dry belt and adjustable sprockets from a rice burner engine. There's no point in reinventing the wheel when a suitable head that's already in production can be adapted to a different application. The Atlas engine is about 250 cubic inches, and the cylinder spacing isn't exact, but it's close. There are thousands of those heads available, and they're not terribly expensive. 24 valves, 12 ports, and three Weber DCOE 40 carburetors can be adapted, plus custom built equal length tubing headers- - - -what's not to like?
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!