I have a weiand that came of a 454 Cyclone engine. It was on a 454/415 hp engine the mercruiser made in the late 80's or early 90's. It is rectangular port. It's out in the shed along with the block, crank, heads and roller rockers that I bought last year to build another engine. I know I have pics on the laptop at home so I'll check tonight and posts the pics here in the thread.