any experience with Quick Fuel 450 VS Slayer carb on 273 ?

My only experience with 1850 Holley carb on the 273 was good, but got tired of constantly dorking with it. But my 273 was quite a bit hotter than yours, 284 duration solid lifter. I ended up with the OEM Carter about 500cfm, which was better, but the best was with a 750 Thermoquad off a 71 340. By then the 273 had J heads, 340 cam and intake. I'm thinking 450 cfm might be a bit small?