Several things come to mind here. First the term " High Rise Manifolds" I can think of three different styles that would fit this description. First would be the Ford 427 High Riser used in all kinds of Ford products from the '60's i.e. the big block Galaxies,427 cobras and the Thunderbolt Fairlanes, with the term "high rise referring ti the gradual increase in height of their manifolds,again i.e. stock, medium riser and high riser.
The second high riser that came to mind was indeed the tunnel rams of the '70's.
Lastly, anything high enough to stick out of the hood.