If you do try it, make sure that several clearances are still okay. You'll want to check your valve-to-piston, retainer bottom-to-guide, coil bind and overall geometry. The duration will be the same but you will have more lift (6.7%) at every crank angle which is a "bunch" of area under the curve. More ratio will also put more load on your pushrods and lifters. As others have already said... it really depends on your combination whether you will be faster. There is a good chance you will be. The Grump was doing this to his small blocks decades ago and he was pretty fast. Shoot... the exhaust rockers on my small block are way over 1.6/1